If you absolutely must try moving them before they're dormant, make sure they are thoroughly watered over several days beforehand so that the soil is moist right down to the bottom of the roots, prepare the new planting hole before lifting the plants and soak that too, and move as big a block of soil around the roots as you can (manoevring a sheet of plastic or something under the rootball might help to lift it without the soil crumbling away), then make sure they don't dry out after transplanting.
Even doing all that there's a big risk that they'll die so if you can manage to wait until winter, that would be the best approach.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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I've two cherry and two pear which I've tried to train unsucessfully and now want to grow then as uprights but they are to close together
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw