spark plug removal tip
If you're changing your plugs and your rig has seen plenty of wheeling in the dirt and mud, I highly recommend removing the fender wings (for easy access) and thoroughly cleaning out the spark plug wells before removing the plugs. They're pretty deep and can hold tons of crud which you don't want inside your cylinders. Another reason to DIY because a busy shop will probably just do a quick in and out.
I've been using some solvent, a dental pick and compressed air to clean out mine.