I’m not saying that calling a plumber to do this job makes you a weenie — no, I would never suggest that. But replacing the guts of your toilet is a simple thing that you can actually do yourself — and it will impress other people in your household.
Speaking of home repairs, nobody’s going to fault you for bringing in an electrician; electricity can kill you or burn your house down — but what’s the worst that can happen with plumbing? You get wet.
No need to get into specifics on how to do it here, that’s what the internet is for. Suffice to say all you really need is a pair of pliers and maybe a screwdriver– and the only pliers you should have are Channellocks. A couple of bottles of beer couldn’t hurt, either.
After an hour or so, you can transform your anemic toilet into a supersonic poop machine that whisks away waste in a ferocious whirlpool of fury. You may get up in the middle of the night and flush it, just to marvel at how awesome it is — and how talented you are for making it happen. But that would be a waste of water.