Oh He doesn't like standing still. Well after you complete something like half the grooming tools, walk him in a couple circles, maybe back him up a few steps. Then come back, finish and repeat. Then once you get the saddle and girth on walk him again and then the breastplate and boots, walk him again and repeat after the bridle. Then walk him or ride him to the arena:)
The barn I go to has hooks in the stall and you can tie your horse up there, or, if your horse is spooky like mine, just slip the lead rope through to about an arm's length to forearm length (this is without tying) or use a quick release knot or trailer knot and tie at the hooks arm's length away. Or wrap the lead line around a post.