Is it important for a junior to have a pre-shot routine to hit good shots, so teach him one like this
Too many players worry about mechanical and technical things throughout their swing and never focus on balance which is the key to a stable shot, see if you are in balance by trying to hold your finish position until your ball lands
In strong winds make sure to take more club, play the ball back in your stance and shorten your swing from shoulder to shoulder length to create a low, piercing shot