Installing one of these things isn't rocket science, but because you could end up on the roof, quite dangerous. Because of the height, OSHA rules (if they are followed) will add a fair amount of time to the task to prepare the proper fall protection. Most don't use pvc. A solid duct is better than flexible.
I really like my tubular skylight with optional exhaust fan. I replaced my existing light/fan assembly in the bathroom with this. It requires one hole for the skylight (I used the 10" model - no structural work), and a second if you use the optional fan. This would only work if you had attic above the room. It works very well, the remote fan is very quiet; so much so, that a switch with a timer or indicator light might be a good idea. Check it out at www.solatube.com.