How’s your water pressure? Those slick low-boy units use a large tube spraying water directly into bowl (well, mine did) for scrubbing - if your water pressure isn’t up to it, stick with full-sized tank models.
I haven’t looked, but DIY has to be full of videos of how to remove/install a toilet (properly called a “water closet” - now you know where that word came from for the “closet bolts” and such).
The big boxes ar OK on this - as long as you stick with Am Std or Kohler models - and ones NAMED Am Std/Kohler - not “by xxxxxxx” - they make crap lines for the big boxes just like everyone else.
DO NOT BUY the ring at the big box - I did and now have a New! Improved! Reinforced! piece of crap - the ring is to be 100% beeswax yes, beeswax. This piece of crap is a plastic ring with a thin coating of wax.
Find a real plumbing supply - and it wouldn’t hurt to throw a bit larger purchase their way, esp. if you want the option of having them around next year.
buy a new ring and the weird closet bolts (the flat head slides under the flange).
You will also need a caulking gun and waterproof (preferably silicone) caulk.
Install water line on tank, place ring on flange, install bolts, lower w/c onto ring (and the mounting holes over the bolts), press down evenly all around the closet until it is sitting on the floor. Caulk perimeter.
Install washer, nuts, and caps on bolts, carefully snugging then down - do not tighten once it touches the ceramic - it will break.
Connect water supply to shut-off, turn on water.
You’re done. Total time:
Pro: 10 minutes
handy person: 15 mins
complete klutz: 30 mins.
A plumber will absolutely love the job unless it is in a tiny space with no way to get to the water connection - toilets are their bread and butter, and people who are intimidated by them a gold mines.
Apartment renters in large, rent-controlled cities:
One slumlord trich to get people to leave is to remove the toilet “it needs repair”. If you have a toilet, water line, and ring in the closet…