Oh my god, I'm not going to point fingers but some of that advice is atrocious!
Im just going to say, don't use a mounting block, because that is escaping the problem instead of fixing it. He is only going to try and swing his head higher, and you will soon have a rearer on your hands.
Don't use a treat either, unless you want to have fingers missing. Also using a treat will fool the horse into trying to chew it, and he will smash down on the bit with his teeth. That would hurt.
Most horses have a reason for being bit shy. Its rare that a horse is just 'stubborn' and trying to be an @sshole. They usually have a reason, whether it be pain, or fear, etc.
Are you gentle when bridling? Imagine if it were you. Would you like someone jamming something metal into your mouth, and clanking it around on your teeth? Think if someone grinded your teeth with a spoon. Is that pleasant?
It could also be a tooth problem. Has he had his teeth floated lately?
Check his bars, lips, and gums. Any sores?
Does the bit fit? Does it pinch him, or have a sharp spot on it?
If it is simply a behavioral matter, stand at the shoulder and get ready to put the bridle on like normal. ( http://www.rockinhorsestables.com/images/bridling.gif )
If you hold the bridle like that in the picture, and keep your arms firm, he shouldn't be able to shake his head around very easily.
Stick your fingers in the upper corners of his mouth, and move them under his tongue. Be careful to stay back on the bars, away from his teeth. The tickling of your fingers should cause him to want to open his mouth. Slip the bridle in when he does, and praise.