There is no sense calling somebody out for a job that takes fifteen minutes and a bucket. These five are safe for a homeowner with ordinary tools. The list of things not to attempt is at the bottom, and it is the more important list.
1. Clean a sink P-trap
The U-bend under a sink is where most kitchen and bathroom clogs actually live. Put a bucket underneath, unscrew the two slip nuts by hand — they are usually plastic and hand-tight is enough — and pull the trap off. Clean it out, check the washers are seated properly, and reassemble hand-tight plus a small nudge.
If the trap is clean and the blockage is further in, stop there. The wall arm goes into the branch line, and that is a different job.
2. Replace a toilet flapper
A toilet that runs intermittently, or hisses and refills on its own, almost always has a worn flapper. Shut the supply valve, flush to empty, unclip the old one, take it to the shop to match it, clip the new one on. Under ten dollars, and a running toilet wastes a serious volume of water.
3. Clear a shower drain of hair
A plastic barbed drain tool costs a couple of dollars and does this better than anything chemical. Feed it in, twist, pull. It is thoroughly unpleasant and completely effective. Then fit a hair strainer so you do not do it again.
4. Plunge properly
Most plunging fails because of the wrong plunger and the wrong technique. A toilet needs a flange plunger, with the rubber sleeve extended into the outlet. A sink needs a flat cup plunger, and you must block the overflow hole with a wet cloth or you are just pushing air around.
Then: firm, controlled strokes keeping the seal, with the last pull sharp. Fast splashy plunging accomplishes nothing but mess.
5. Clean an aerator or showerhead
Pressure dropping at one fixture is usually scale in the aerator, not a supply problem. Unscrew it, soak it in vinegar overnight, scrub with an old toothbrush, refit. In hard-water country this is a twice-a-year job and it makes a noticeable difference.
The honest reason for that boundary
A cleared clog and a solved problem are not the same thing. Clearing the same drain yourself three times means three times a diagnosis did not happen — and the underlying cause, whether roots or a belly in the line, carried on getting worse while you were winning.
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