The front side is obviously not a problem but the backside is a nightmare to work in! Wash and degrease the engine so you will be working in as clean of an environment as possible.
The intake will need to come out, all 9,000 (it seems) pieces of it. Keep things really clean by covering the exposed intake with plastic. Keep every piece of dirt out of the area. Make sure you have a good plug socket and a universal joint to reach down the spark plug tube. Having a slim extension between the universal joint and the ratchet will help out too.
Good luck and take your time!!!