You shouldn't have to remove the clutch cover. You'll have too remove the kicker. Pop the old seal out, and install the new one. Put it back and re-tourque it to 47ft/lbs if I remember correctly. Search on here or look in the downloadable manual for that Tourque number for sure.
When you do install the new one, wrap a piece of tape over the splines on the Kicker shaft, so you don't cut or mess up the new seal. I use a small piece of electrical tape.
I also lube up my seals with PC-03 seal grease and put a little blue locktite on the outside of them.
Good Luck!