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To save yourself a LOT of effort bite the bullet and turn the boat over. First remove the engine. Then rig up a couple of saw horse type supports to put the hull on to do the work. Make them tall enough to minimize stooping and bending. Get a couple of potential new fishing buddies to help with turn the boat over.

CAUTION: Don't do any bottom sanding or stripping over a lawn. Bottom paint will poison the grass and soil for years. Don't ask how I know.