This is one of the potential problems I see with a global forum... there are some instructions which are specific to certain geographic areas.
In Houston (and probably most of the Gulf Coast) it is about as humid as most rooting chambers. Partial shade is equivalent or better than full sun elsewhere. As an aside, last year we vacationed in Galveston. I had several of my newly potted cuttings in Air-Pots on the deck of the beach house. By the the time we left Galveston, several of the cuttings had roots extending <1" from the holes of the containers. They were still white and showed no signs of air-pruning until we made it back to the Austin area where they dried out very quickly.