I don't know how to exactly put a bridle on or take one off. Can someone explain to me how????
We can definitely explain to you but you really need to have someone show you in person the first few times.
The left hand is correct, there are a few options for the right.
I prefer reaching under and around the horses jaw with my right holding the bridle half way down. This allows you to hold the horses head and gives you more control. It will also keep the horses head in the proper position, I usually see pretty funny faces or misbehaving horses when people do it the other way. I really don't like the other way since you don't have any control. Ask with the left (hold the bit, slide your thumb in the corner of the mouth). Do NOT push the bit in. When the horse opens their mouth use your right hand to slide the bridle up. I usually put if over the right ear first.
Then check/adjust. Nothing twisted, noseband underneath. Browband in the right spot. The tighten your buckles. Noseband you want loose but right there should the horse open the mouth. A few fingers. Throatlatch is relatively loose. "A fist" is what people usually say.
Too loose doesn't do anything and too tight can cause problems/discomfort.
When teaching someone to bridle I usually stand on the right and help them guide the bridle in after showing them several times. The little kids I'll have do one hand at a time.
I will do the way ponyroll mentioned with the ponies. It's silly to kneel to bridle a quiet horse! lol
I'm 5'3" and am the one called upon to bridle when the tall horses are being difficult.
Regarding hitting the teeth. A well trained horse will know to spit the bit out. Do NOT intentionally try to help. Too many people over do it and I've even see people literally take the bit in two hands and try to guide it out while the poor horse is making all sorts of faces.
Make sure the horses head is vertical/close to it (not above a 45 degree angle) and just go slow. Don't drop it, but don't crawl or play with the bit. The horse should spit it out on their own.
Again, have someone show you in person.
For a visual: