sallyg said: I doubt the peaches will be better off for summer in pots.
they already sound in trouble.
The sooner you get these things in the ground, the better.
What is meant by Autumn planting... Is you wait till autumn before digging tree.
Growing out a tree that has been container grown is difficult, Really best to find a provider that will provide a freshly dug balled and burlap plant...
Or... just plant a peach pit... They are about the easiest plant in the world to grow from seed.