IMHO, the later you transplant the better as all plants are pretty stressed out right now after surviving months of 100 degree temps. I'd wait until at least Oct to do this if you possibly can. Also, have the transplant hole dug and prepped - this will minimize root exposure to sun and air.

Also, there are a couple of methods for digging up mature trees (circle-digging around the roots about 2 ft out - this takes a couple of months or "water digging" - removing the soil with pressurized water - these are the two methods I'm familiar with). Do you know yet how you will move the plant?

I was hoping to relocate the Ficus within my property, so I am assuming that it should be a one day affair. Here's what I have planned for the 7ft tree

Wait until Sep end
Prep the hole where it will end up
Dig out far and deep from the trunk
Pick upi tree in Wheel barrow
place it in its new spot
fill hole

I havent had much luck with transplanting smaller plants in the past. Any thoughts?