Me and our lead installer are small guys. I am 5'10" and 130#, he is a bit smaller at 5'6"/125#. Nice part is getting into crawlspaces. I once had to go behind a furnace to change a leaking blackpipe union, there was 8 1/2" between the furnace and the wall....I couldn't believe I fit. This does come back to bite us on the ass though since the others are bigger, older guys we're stuck with crappy, cramped crawlspaces. Me and the other little guy were doing a mobile home install, had to run lineset under the trailer that had a ground clearance of 10" there was dead rats, cat poo, and a rotting cat carcas under there. Needless to say I went home to shower as soon as the crawling was done, yuk. I think the others like to see the one (me) bidding these jobs out getting down and dirty with them too.
There are 3 ways to do anything in life; Good, Fast, Slow: You can pick any 2.
I have some of them tub handles sitting on my desk, from my pops old plumbing biz.
Actually, there is a little bell off to the other side of the toilet. When you are done, you ring it and a munchkin comes out of the little door, grabs some TP and wipes you butt for ya.