Tip 1: Shave first, unless your doctor has a pretty nurse, then you don't need to. She can do it.
Tip 2: Get yourself some big freezer bags for ice. You'll need to rest afterwards and keeping ice on your lap helps with discomfort and swelling.
Tip 3: Resist the urge to, well, you know, "be the master of your own domain" to soon (just to see if the procedure worked). I did that a couple of days later and my blood pressure dropped and I passed out. Not a good thing to be lying in your bathroom floor with your pants down and .... You get the picture.
Tip 4: You are going to feel nodules (for lack of a better term) in your bean bag for quite some time. This is normal. It's just the ends of things that are healing up.
Tip 5: Enjoy. Remember, for you, sex is just for fun, now.
One last thing, the doc is going to want you to bring some "samples" back a couple of times afterwards just to make sure you really are shooting blanks. Most guys use a baby food jar, and a brown paper bag to make the quick delivery to their urologist's office (some guys send their wives in with it :). I think you ought to have some fun so I recommend this ... Get yourself a big mayonaise jar. Fill it up with white dishwashing liquid. Splash a little water on your face then walk into your doctor's office and set it on the counter, start panting and say "here's my sample, I'll bring another in tomorrow." Watch their faces. ;D
This needs to go down as post of the year.