As stated by HL, item one is an absolute! At Grob in Bluffton they have a
fuselage dolly that holds
it firmly in place to keep the fuselage from rotating after the right wing
is in place.

I assemble mine (upon rare occasion anymore since I keep it assembled in a
hangar now) by myself
with a wing holder but the most important little item turned out to be a
jack under the right wing with
very thick padding on top, under the wing about 1-2 feet from the fuselage
placed under the spar.
This keeps the fuselage from rotating when the weight of the left wing root
starts to load the fuselage
on its way in. A wing support at the tip doesn't really do the job because
of the wing flex and lets the
fuselage move sideways slightly.

Gale Winnett
Grob 102 III