John Carroll, Working Alone: Tips and Techniques for Solo Building
(Taunton, 2001), p. 43 ff has three suggestions. Any of them will work
fine.

1. Hire a crew to stop by on their way home (you can have it securely
braced in 15 min. or less)

2. Build the walls in manageable sections.

3. Use wall jacks

Good luck,
H