On a practical level, get 2 large hooks put in the wall about your grooming table – one about 12″ above his shoulder and the other at the same height, 24″ apart. When you lift him onto the table, use his lead to tie him to the hook above his shoulder. Use another lead to attach to the other hook, take it under his tummy and tie it back on to the same hook. This way he is restrained and you have 2 hands to groom with. You cannot hold him still, brush and hold the skin with one hand. 🙂
With 2 hands you have a better chance of grooming efficiently and without hurting him.