How hard is it to put in new seals for the lower unit? Never have done this before. Is this all I will need to do, or do I also need to put in new bearings in the lower unit also. How about a manual that would give me some instructions before getting started? Dealer says about 65.00 for seal kit, and about 3 hrs. / 255.00 for labor. Would love to be able to save this money for something else.

Any help is appreciated.