I have a 1995 force 40hp and the adapter plate gasket is bad and there is water leaking into the lower cowl. How big of a job is it to replace. I am able to work on the motor for example change impeller, clean carb ect. it it something that can be done without having a pro do it. Money is tight right now so i would like to do it my self. And im going to get a repair manuel if i attempt it. Thanks Alot