No
Hi Wpisar,
I'd be very reluctant to do one wing at a time, especially if it's a fairly long time between mountings. My reluctance stems from the fact that unless the airplane is in EXACTLY the same fore/aft/lateral level position for the second wing, you could have a difference in incidence between the two wings. This condition is very, very difficult to correct later.
Secondly, don't buy plumb bobs. Use a nut or bolt or anything, tied to a string (four of them) to set wing sweep. Just hang the strings from the leading edges with duct tape or similar with the nut/bolt/whatever, dangling. Then stretch a string from one side of the airplane to the other, six inches or so off the floor, not quite touching all four strings and you'll see the sweep/no sweep by the distance between the four dangling strings and the long string perpendicular to them.
I did this by myself and used two concrete blocks with the string tied to them coming over their tops and slowly moved the blocks closer to the strings, one side at a time until you finally inch up to the dangling ones.
Regards,