Brush your puppy everyday, handle his paws and all over so he gets used to it. Run the clippers around him and let him get used to the sound and vibration so when he is old enough to get groomed ( and you will know it) he won't be afraid.
Just trim the ends right now if necessary. And paws. Let him hear the scissors snip and blow dryer run too.
Zoey is 7 months and all I do is her ears , paws , pads ,butt and too too.