As someone who has set up multiple CRT projectors, I can tell you that it’s not for the faint of heart lol. This of course depends on what brand etc, but the gist of it is, you have to manually calibrate the individual lenses to align the thing. This would often change due to any number of things, someone bumped it, heat/cold, bad tolerances on the adjustments…If you’re dealing with one of the more high endish brands, they aren’t bad, but some of the cheap ones are quite a bear to handle. You also get into problems with cheaper models, where you can get the center aligned, but one of more of the edges would be out of alignment. Getting one of those dialed in, so that the entire screen was actually aligned wasn’t particularly easy most of the time.
That being said, a good CRT projector in a dark room with a good screen, can be pretty damn good. I worked in a high end audio store, that also did some video back in the old days, so we did quite a few surround sound/home theater setups.