Start with a small flat bade screwdriver and work your way up, perhaps a bolster, feeding them in as you work along one length work a strip of plywood or similar in and keep going gradually raising it until you can get a 4x2 or something under it and eventually a jack.
Or maybe fix say an old scaffold board (longer than the shed so it pokes out each end) to the side you want to start with and fix it to the side of the shed into the studs set it just above the lowest jack level and then you can get a jack under each end of the scaffold board.
Or maybe fix say an old scaffold board (longer than the shed so it pokes out each end) to the side you want to start with and fix it to the side of the shed into the studs set it just above the lowest jack level and then you can get a jack under each end of the scaffold board.
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