Put a block of wood under skag and jacked trailer until weight was on skag/wood, backed off nuts and pulled back on motor enough to get wedge's on two top bolts, then did same to bottom bolts.
Went pretty easy, cept for the climbing in and out of the boat ...
Could only seal bolt on inside of transom, but bolt holes in wood are sealed with resin.
I shouldn't have any issues for at least 30 years ... LOL