Sure, it is not easy but it is possible. Get a couple folding tables from Walmart, a couple moving blankets for each side, lift up the wing a bit and put the table under the wing with the blanket on for support, then tackle the bolts. Good luck. Email if you want me to explain better. Good luck.
Was this on an A model? it took me two days to install mine, the whole time I was thinking to my self, I hope I never have to remove these bolts.....Ever!
I was just thinking the same thing. final assembly of the wings was the only time that I had wished I had bought a 7 instead of a 6. I swore I would sell the plane before every taking them off. Doing this job out on the ramp in August didn't help either.