It's not all that bad. Read through the posts here:
http://androidforums.com/incredible...root-guide-updated-4-15-est-oct-1-2010-a.html
I can tell you from rooting my Evo using Unrevoked (similar enough to the incredible) that it is a pretty painless process. I feel compelled to ask, though, is this the only reason you want to root, now? Is potentially saving your power button (which shouldn't break anyway) worth voiding your warranty? You can unroot a successfully rooted phone, but you do run the risk of bricking your phone throughout the whole process. It's highly unlikely at this stage, but it's still something you should keep in mind.