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Assuming the bottom bolts are not using the blind holes and are in the slots.

You need a helper to steady the motor.

Make sure you have enough height on the tongue jack travel. If not, place blocks under wheel to gain sufficient height.

Block the trailer wheels.
Tilt the engine down.
Raise the tongue till the skeg is touching the ground.
Loosen the lower bolts in the slots
Loosen and remove the upper bolts. (Have friend steady motor)
Raise the tongue to appropriate height to
reinsert upper bolts in correct holes with fresh sealant.