re: How big of a PITA is it to change bathroom faucets?

if you are talking about sink faucets, there is nothing really complicated about it...however, being a contortionist will help a lot...

one normal complication is that the small valves under the sink sometimes leak after you have turned them off and back on...I would consider either replacing them while you are working on the sink or just shutting the water off at the meter and not touching the valves under the sink at all...

whatever you chose, be sure you have the tools and the knowhow to shut the water off to the whole house if shite hits the fan...