Leave the port side transom bracket bolted. Leave the port transom bracket to PTT unit bolts tight. Stick a block of wood between the transom and the tilting part of the motor, to give it some support.
The engine should not move at all, when you unbolt the starboard side transom bracket. You can always use a bungee cord to tie the motor to the port stern eye, although I have never needed to do that.
The engine should not move at all, when you unbolt the starboard side transom bracket. You can always use a bungee cord to tie the motor to the port stern eye, although I have never needed to do that.