Since you live near Point, you shpuld be able to find some arborists easily.
You should be able to go ahead rather soon with the planting, the real hot weather should be behind you.
Ron Zillmer over at Midstate helped develop these planting standars.
1. feel the ball for woody roots protruding.
2. dig a hole the size of the ball to the depth found in step one.
3. carfully remove the soil down to the root
flair, unravel any encircling root and bury
them in trenches heading out form tyh ball.
4. If the woody roots look sound, remove any
adventiciouse roots from the trunk.
5. with a spade or fork, free up the soil around
the dug hole without disturbing the roots you
burried.
6. Water the ssoil in and dispose of any spoil
dirt.
7. Steak loosly.
He would probibly be able to direct you to a good nursery that will have sandy root balls.
Remember that with trees, smaller is better.