1981 Evinrude 35hp outboard...need to replace clutch dog and possible foward gear. I have never been in a lower unit. How easy or difficult is this? Any special tools involved? I have a manual and it looks fairly easy. I need to save some dough...nearest dealer says it's about a $500-700 job. Parts/ mostly labor. Also my front motor mount needs replacing...difficult? Any help is greatly appreciated.