Former owner of house really tightened those bolts down hard. Easier to hire a plumber. They met the challenge and installed both bidets for a grand total of 214. (We got two of this LEIVI make/model). It was a breeze for the licensed plumber of course, but he recognized other things going on with our toilets that needed replacement, amounting to an additional 50 in added expense, but it certainly guaranteed our porcelain thrones are up to par. As far as the experience with this bidet goes, it works great. For #1 — we have no need for TP, thanks to the excellent spray settings and air dryer. but for #2 — I still rip off a couple squares, check the nether-regions. Better safe than sorry, right. Even still, so far, everytime the LEIVI has passed the TP test.