Nope, you don't have to wait after a transplant. That is not as stressful as you think, if you do it gently, and do it when the rootball is dry and sticks together well. Transplanting a wet, heavy root ball that falls apart, tearing roots, IS stressful. Remember it's all technique, but luckily there's not much to the technique! Even a stoner can do it (those stoners, is there nothing they can't do?).