ive broke untold amount of horse in and i would start by getting you horse used to the bridle but only use the bit take all other straps of .nose band brow band ect.put a head collar over the top and walk round or leave in a stable for about 20 mins a day just so he gets used to the bit.also when you brushed your horse stand there and practice putting numnah on and off back walking round afew hours a day the work will pay of.
have you got a playfull bit ?
hope this helps