It sounds like you made a thoughtful and informed treatment choice, so don't bother second-guessing yourself. Best of luck with your treatment.
open RP and, while surgery is never a picnic, it wasn't bad. Very little pain. The drugs will control the pain very effectively, and you won't need them after a few days. The catheter is a drag, but you'll live through it.
If you haven't already read it, I recommend the "Really Useful List for HW People by HW People" thread: www.healingwell.com/community/default.aspx?f=35&m=1717641
It contains lots of practical tips on what to expect with surgery and how to make it more comfortable. Highly recommended.
Give us a shout when you're on the other side, and let us know how you're doing.