Glad this thread popped up again!
Reminded me of something I found on youtube last year.
I have done this while up about 20' in a tree. Yes, there is a pucker factor the first time you do it waaaay up there, but if you practice a bunch at ground level all should be fine.
( I did it in my OpenShot which doesn't have a bar going around you or the extended bars shown in the second video...
)
One thing these guys aren't doing, that I do, is to get a hold of two ropes before starting. First, I grab the strap supplied with the stand that is used to hold the top and bottom together while walking. I strap it to the very front of the platform and hold the tag end securely in my hand or teeth. I also grab the line that is supplied with the stand to tether the top and bottom to each other so it doesn't fall if something goes wrong. This way, if something goes wrong while performing the leveling technique shown in the videos below, I can recover the platform more easily with two ropes. Both video's are informative and the technique saves a LOT of time and SWEATING by not needing to climb back down, make your adjustments, and climb back up.
https://www.youtube.com/watch?v=G6e-Zj_v9eU
https://www.youtube.com/watch?v=N93PYwmfRXE
Don't know why I cannot get these to embed, so I added the cold links.