Start practicing with a Dremel now. Even just having it running nearby while you treat him for non reactive behavior will be good to get him used to the noise. Practice holding his paws without him pulling back, just for a second, treat. Gradually increase how long you ask for his paws until you give reward. Some like to use a grooming arm, or put them up on a table, others like to ask them to lay down on their side between their legs. Whichever works for you it'll be good to get started in the routine of so when those nails do need trimmed he will already be comfortable with all of that.