Flipping the boat is the easiest, but disassembling the hulls from the crossbars isn't too hard. You are correct, there are eight bolts total that must be removed- an inboard and an outboard bolt at each end of each crossbar.
Remove the trampoline, all shrouds/bridal wires, rudders, righting line, and possibly the jib blocks. Leave the hulls on the trailer and strap them down individually. This should prevent them from falling over once you remove the cross bars. You will need a socket wrench, an allen wrench (sorry, I don't remember the sizes, around 9/16"), and possibly a pair of vice grips or a large flat blade screwdriver. I like to start by loosening all of the bolts a little bit at first. Then once they're all lossened you can completly remove the bolts. You may need to hold the bottom outboard nut from spinning either with the vice grips or by wedging the flat blade screwdriver between the nut and the steel anchor bar.
Reassembly is a little tricky. It's easiest to lower the crossbars onto the inboard bolts. Make sure you clean all the threads. It's helpful to have someone assist you with lowering the crossbars down, but not absolutely required. So get all inboard bolts started first and then do the outside bolts. After sailing, you should go back and re-tighten all the bolts.
Having the crossbars apart also gives you the opportunity to inspect them for any cracks under the normally covered outboard ends.
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