Just take it very gradually.
It might help to do some work when he doesn't need grooming or drying, and just gently stroke him with the towel or comb him through, and then give him lots of praise and some treats.
Gradually build up to being a little more as you would need to be when actually doing the job - continue treating and praising.
Honey dislikes drying/grooming, and we have found that telling her which paw we are drying helps, as we are working with her rather than against her.
Primula is a great aid for particularly nasty knots!