Here, this is for 996 it is about 10 pages of info.
Porsche 996 Rear Main Seal (RMS) Removal and Re-Install - Honda, Acura Tech Website, tutorials, tuning and HOW-TO's. Drag racing, street racing, road racing - C-speedracing.com
Buy the way if you are going to do it, please take lots of photos and make a documentary, do it yourself tread about it. Just what ever you do, do not rush any thing and take your time. If your RMS leaks a lot, change that too. If you buy a shop manual, that will always help too, specially if your local mechanics are unfamiliar with your car. let use now.