If he's kicky be careful.  I had a big QH who had some VERY bad farrier experiences before I came to own him, and he was terrified of hoof handling.  He'd stomp down his feet or squirm until you dropped the foot.  Then he learned that squirming got his feet free. 

     What I did was work on picking his feet up for brief seconds using a lead rope. That way my face or hands were clear of waving legs. Make a "noose" out of your leadrope by threading the tail of the rope through either the mouth of the snap, or the base of the snap, whichever it slides through the easiest.  Put the noose around the pastern. Practice just getting him to lift all 4 feet by pressure of the rope. Even just an inch for 2 seconds. It helps on the back ones to pull backwards and out a little. Have a buddy hold the horse, but don't tie him.  The rope is easier to hang onto when he starts swinging his feet around.  When he's comfortable lifting his feet just a tad with the rope, try adding a nice stout western saddle.  First just slightly loop the rope over the horn for the front feet, and for the back, well, I found that once the front feet were done (in my horse's case) the backs weren't so bad.   Anyhow, once you're pretty sure the horse won't explode you can dally the rope a bit more on the saddle horn so when he tries to be a butt and stomp his foot around or get fidgety he can move....but you still have his foot and he doesn't "get away" with taking his foot. Move with him if he tries to scoot.  Don't let him get away. Don't dally the rope so much that it can't slide free if you get into a real fit.  I also used a gadget called The Stableizer when this horse was real bad.  It helped.   My horse's main problem was with the front feet.  His backside was fine.  He would literally stand with every muscle trembling while the farrier calmly trimmed.  He knew he needed to be good, but someone really screwed him up.  It takes time to undo painful memories.  The lunging when they misbehave thing works for some horses, but mine would just get more upset and frazzled when we lunged him.  The rope around the leg also helps to train the horse for what to do if he were caught in something like a fence or a bailing twine or hay bag.  It's good to get ropes and hoses and such around the legs, just don't tie hard & fast, and work in an enclosed safe area. Work on this after lunging if possible so the horse isn't fresh and is listening.  This is just one suggestion,  I'm sure people have more ideas for you.  I know how frustrating it can be.  Try giving your horse some bute before the trim.  It will help with pain and inflammation if you need to have him trimmed again while he's still healing from his surgery.  Whatever you do, don't take my post as "tie the horses leg up and trim him" because that's not what I did.  My stinker just realized that if he squirmed and put his foot down he was free.  All I did was keep ahold of his foot by using the rope and he learned that squirming didn't equal freedom.  Good luck, be safe. 

Amanda