Sounds like climbers may not be for you.

But for coverI usually attach brushy limbs to the base with zip ties (if you leave them loose you can reuse them) then I climb to the lower portion of the canopy. Tree selection is the key- if the canopy is 30' up and you don't wish to climb that high pick another tree.
Ilike to climb between 20& 23' at theseat, so a tree with a canopy ~30' up is just about right. I'll go lower if the wind is right.