Find a stud, patch a hole, hang things that stay up, and fix a sticking door
Most household repairs are not skilled work — they are ordinary work that nobody showed you. Hanging a shelf that does not fall down, patching the hole where the last one did, and making a door stop sticking are each an afternoon's learning that pays back for the rest of your life. The reason people pay someone is almost never difficulty. It is not knowing which screw, which anchor, and where the wood is behind the wall. That is what this guide is about.
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Knowing where to stop is a skill, not a failure of nerve. These jobs are not DIY:
Cordless drill/driver
The one tool worth real money. It drills and drives screws.
Stud finder
$20. Or use the knock-and-nail method in this guide.
Tape measure and pencil
Measure twice. Everyone says it because everyone has learned it the hard way.
Spirit level
A two-foot one. A phone app is not good enough for a shelf.
Screwdrivers, Phillips and flat
Several sizes. The wrong size chews the screw head.
Utility knife
For drywall, packaging, and scoring paint before opening a stuck window.
Putty knife and filler
For every hole you will ever make.
Safety glasses
Non-negotiable. Eyes do not grow back.
Part 1
Drywall is about half an inch of compressed chalk. It holds nothing. Everything heavy must reach the timber studs behind it, or use an anchor designed for the load. This one concept prevents most failed DIY.
Know the spacing
Studs are almost always 16 inches apart, center to center — occasionally 24 in newer or cheaper construction. Find one and you can measure to the rest. They always sit beside windows and doors, and at every corner.
Use an electronic finder properly
Start flat on the wall away from the target, hold the button, and slide slowly. Mark where it first lights up, then approach from the other side and mark again. The stud center is between your two marks. Approaching from one side only gives you an edge, not a center.
The no-tool methods
Knock along the wall with a knuckle — hollow between studs, solid and dull over one. Or look for the tiny dimples of drywall screws in raking light, which run in a vertical line straight down a stud. Electrical boxes are also nailed to the side of a stud, so there is one right beside every socket.
Confirm before committing
Drive a small finishing nail where you think the center is. Solid resistance the whole way means timber. If it goes through into space, you missed — and a pinhole is nothing to patch. Always confirm with a nail before drilling a big hole.
Safety
Never drill blind directly above or below a socket or switch — cables run vertically to them. Same beside sinks and toilets, where pipes run. If a stud finder has a live-wire mode, use it, and still treat it as advice rather than proof.
Part 2
When you cannot hit a stud, the anchor does the work. Choosing wrong is why shelves end up on the floor with a crater above them.
Part 3
Three sizes, three methods. All of them are more forgiving than people expect, because the final sanding hides a great deal.
Nail holes and small dents
Press lightweight filler in with a putty knife, leaving it very slightly proud of the wall. Let it dry fully — rushing is the main cause of bad patches. Sand flush with fine paper, then prime the spot before painting, or the patch will drink the paint and show as a dull circle.
Holes up to a few inches
Use a self-adhesive mesh patch. Stick it centred over the hole, then spread joint compound over it with a wide knife, feathering the edges well outward. Two or three thin coats, sanding between, beats one thick one every time — thick compound cracks as it dries.
Large holes — the California patch
Cut a square of new drywall bigger than the hole. On its back, score and snap away the gypsum around the edges, leaving an inch of paper facing all round. Cut the wall hole square, put the plug in, and bed that paper flange into compound. The paper acts as its own tape, and it is the tidiest repair there is.
Feather, do not build
The commonest mistake is making the patch flat and the edges abrupt. Spread each coat wider than the last — eight or ten inches out for a big patch. The eye sees edges, not thickness.
Texture and paint
If your walls are textured, spray texture in a can matches most finishes; practice on cardboard to get the distance right. Prime, then paint. Painting a whole wall corner-to-corner hides a repair far better than spot-painting ever will.
Part 4
Nearly always one of three causes, and the first one is free.
Tighten the hinges first
Doors sag because hinge screws work loose. Tighten every screw on both leaves. If a screw just spins, the hole is stripped: take it out, tap in a wooden matchstick or golf tee with wood glue, snap it flush, let it dry, and drive the screw again into fresh timber.
The long-screw trick
Replace one short screw in the top hinge, on the frame side, with a three-inch screw. That reaches past the frame into the structural timber behind it and pulls the whole door back up. It fixes a huge proportion of sagging doors in five minutes.
Find where it actually rubs
Slide a piece of paper around the closed door's edge; where it will not pass, that is your contact point. Or close it on a strip of carbon-marked paper. Do not guess and start planing.
Latch not catching
Look at the strike plate on the frame — the latch usually misses by a fraction. You can often file the plate opening slightly, or unscrew it and shift it a couple of millimetres. Only if it is far out should you move the plate properly and fill the old screw holes.
Planing, as a last resort
Only after hinges. Mark the rub area, take the door off, and remove a very little at a time from the hinge edge rather than the latch edge where possible. You cannot put wood back.
Part 5
Knowing the right word is half of getting good help.
Reading changes nothing on its own.
Next guide
Fill a hole properly, cut a straight line, and paint a room that looks done
