So I am a newbie to boat ownership. I purchased a boat from a friend it is very good shape. It is a 2003 and he bought it new. I have had it this will be my 3rd season. The fall before I purchased it he had the lower unit pulled and new gaskets, gimble bearing and some other things done. I have not yet pulled the drive off and am guessing I should have done this already to grease things. Is this a difficult job ? Any gotchas? I will post the S/N number when I get home, It is a Merc Cruiser 5.0