Alot of what these people are saying is great advice. If you can't handle him find a trainer. You don't want to get hurt if you you don't understand enough to fix the problem. If you can't afford something like that study up on why your horse is doing that and what the reasons could be. Check all reasons off, including you doing something wrong or him/her being in pain. After that is assessed try working on all the groundwork and manners first(like previously mentioned). You want to learn with your horse in a safe way and the ground is the first place you want to start. Try different angles of approaching the situation. Every horse is different and learns at a different pace, just like we do. Some you have to be more patient with cause they need more repitition and some learn after a few times and will do it right on cue everytime after that. It just depends. That horse wouldn't act that way under saddle if it had an understanding of exactly what you were trying to get across to him/her. You might have been asking in the wrong way. Sending too many signals is often the problem with people still learning themselves usually because they don't know the right way of getting it across to their horse. Ultimately you want your horse to work with you instead of against you. Use the internet, it works wonders. There are hundreds of trainers that have their training help online. If you need some references there are a few big names you could look for that do the job right the first time: lynn palm, clinton anderson, pat parelli, john lyons(his son does more now). If you are into horses I'm sure you've heard of many of them. They are all natural horsemanship trainers who have shared their methods of training making the cowboy days of "breaking" a memory of the past. Most of them work western(lynn palm does both...she's personally my favorite probably because she shocked the world with being the first person to win 2 superhorse titles on the same horse, the famous Rugged lark...r.i.p and she made brideless riding a thing to accomplish) Just like mentioned before youtube is a wonderful tool, but don't forget about forums like this one, magazine articles, live clinics, and the infamous rfdtv channel if you get it. Investing in buying training videos for references really helps too. If you needed help further don't be scared to ask. We are all here to help one another. I'm sure we all have our own personal expertise in the horse world and we are on here for the same reasons. We love horses and we want to give help as much as we want to recieve help. I hope that helped. Happy training.