Taking the bumper isn't really hard, it's just irritating & time consuming the first time you do it.
One thing to remember is that there's two parts to your bumper : the cover, and the bumper support.
The cover is what you'll be removing, and it's flexible, so make sure you hold it in two places when you handle it so that it doesn't bend too much.
I'm pretty sure you can find a decent write-up on here on how to do it. If not, you can wait until Probetalk comes back online.