General Rule: If a plant at a nursery is grown under shade, especially 50% or more shade, a plant moved outside during bright hot weather will be stressed and probably sunburned. If possible, move out during cloudy weather. Otherwise, don't you stress about little patches of sunburn, because new growth, produced under the new conditions, will usually be adapted (unless it is a species that is always an understory plant).
When I plant a tree, I make a circular soil ridge just outside the rootball to retain hose water. I fertilize, same days as planting, OUTSIDE the soil ridge, to make that soil fertil for when new roots reach it several weeks later.