I just decided to do this fix and was pleasantly surprised to find that I didn't need to use any tools other than a flashlight. I'm no contortionist, but I found it very easy to access the relay without removing anything. I would advise anyone that is interested in replacing their relay to take a look before they start removing bolts. $11 and 2 minutes later and I had fully functional wipers.
*NOTE* My car is a sedan, so I didn't have a rear wiper relay to get in the way. It might be a little more difficult with the rear wiper relay in place.