As long as he has his feathers and you do it early in the day so he has plenty of time to dry off before evening you should be fine. I would take it slow so that his first experiences with showering are positive. I take mine in the shower with me and let them watch me first so they know it is safe and enjoyable. I put the shower on mist and spray mine. You then can increase the spray so that they get fully saturated however I usually started mine out slowly the first few times.