Is it difficult to transfer plants from under grow lights to outdoors?
Nope! You just want to gradually expose any seedlings you start to the sun and outdoor conditions. To do this, first set them in dappled shade for a few hours (or put them outside on an overcast day), and then incrementally increase the amount of sun they receive for a period of several days. Once they are acclimated, you can transplant them into the garden or containers.