. But if you want to do a good job you will not have enough time. "Careening" as it's called, is best for quick patch and slap jobs. If you need to use a sander you'll need electrical
power. The bottom needs to dry out before you can prep and paint
. You need a larger tidal range and several tide cycles, and a protected place where waves will not damage the boat from pounding while grounded. You should also put some old tires beneath to protect it.
You'd be much better off to hire a crane and block the boat. Proper blocking is different on each boat but you sill find strong-points at bulkhead intersections and the centerboard
trunk will be a structural strong point. Support the amas only enough to keep the boat stable. If the boat doesn't have built-in lifting eyes, put the center hull
in slings and tie the mast
to the crane cable so the boat doesn't rotate in the slings, or sling each cross-beam base individually and join them all at the crane attachment point.