What are the tools that every Do-it-Yourselfer must own

My dad has a Multimaster and it's truly awesome.

Like any tool, there are jobs it is good for.

There are quite a few tasks I've found where it would have been really useful - mainly in repairs and renovations, where you aren't ripping out whole floor boards or walls or anything. Those are things where a reciprocating saw, jig saw, circular saw or even a dremel tool (a cutting wheel is always the wrong angle.) won't work well.

He used it to cut out windows of my daughter's playhouse after we put up the plywood walls, and it doesn't do a great job on long cuts like that - he was cutting blind from the inside along the studs and the cuts aren't perpendicular to the sheet (but it's covered with trim).

Have a look at the trap under your sink. Assuming it's PVC with large plastic nuts, all you should need is ChannelLock pliers:

Unscrew the trap from the wall and disposal, and clean the trap itself, or snake the drain going into the wall, depending on where your clog is. Be sure to have a bucket and towels handy since there will be water backed up before the clog and in the trap.

If you can't find the clog either in the trap or with the snake, and you know it's further down the drain (try running some water through the disposal and into the bucket with the trap out), then I have family that swear by these drain bladders that attach to a garden hose, get inserted into the drain (past the vent) and they swell up to seal your end of the pipe while sending water down until the clog is forced out:

Each one of these will cost around $20 give or take, well less than a visit from a plumber.