Depends on how much ground work he's already done? Desensitization is always very useful. Plastic bags, saddles, saddle pads. Bending and flexing the neck. Giving to pressure where you ask like on his sides. Backing with correct head positioning. I taught my mare to lunge without a line when she was a youngin since we had so much time before we actually started her under saddle for riding. I taught her to make circles around barrels without a whip or line, just hand and body signals. She was so attentive to me then when we did finally get her riding. Good luck!