It is an excellent idea to get them used to being messed with at an early age.
We have been grooming William almost daily since we had him at eight weeks. We start with gentle brushing, and then move onto ears, eyes, and teeth cleaning. We clean the ears with cotton wool moistened with ear cleaner and fortunately William is usually co-operative.
It helps if there are two of you, but we do persevere if he decides to be difficult, going back to grooming, and then returning to the ears, but we never end a session before the objective has been achieved.
He is then rewarded and fussed up.