My horse, no matter how hard I tried, he would NOT neck-rein. He was stubborn and wouldn't listen. I switched barns to a barn that was huge in Parelli and I tried some of their methods and I'm hooked. Sonny picked it up quickly...it was easy, for both me and him, and takes a short ammount of time (at least for my horse it did).
First off, neck reining isn't about when you move your hands to the left, that your horse turns left. There is SOOO much more than that. Your whole body MUST play a part of it, or else the horse will never catch on. Just using your hands really means nothing to a horse...it's mainly your legs that will guide him when you neckrein...though with lots of training he can associate just using your hands with it.
Go out and buy a carrot stick (the parelli stick)...no not the expensive one...just get one at a tack shop. I got mine for like $10...it's not orange, but who cares on the color..
Depending on your horse (I wouldn't do this with a horse I didn't trust...just this part, I'll explain at the end what do to if your horse is kinda unpredictable, etc) this is how I went about doing it.
Take the carrot stick (http://lh6.ggpht.com/_qRHihLdg2fM/Rt...E/DSC02249.JPG
.....make sure the string is detachable...if it isn't..it's NOT a carrot stick) and take off the string (also called the Savvy string....no worries, I'll just call it string lol). Take it and tie it around your horses neck...not tight, you want it to be able to move around your horses leg and enough room for you to be able to grab on to it and use it as if you were asking a horse to neckrein with the reins.
Now using JUST a halter and lead rope (just in case you need to make an emergency stop for some reason), mount your horse (you can do this bareback or in a saddle...does not matter)...but keep the carrot stick in your hands. Ask for a walk and then go on the wall of the arena (or if using a roundpen just go around it). Go clockwise (just explaining it if you were going clockwise). Keep the carrot stick in your left hand and use your right hand to stay on the string...don't move the string.
When you are ready, put pressure on your left leg...remove all pressure from your right leg, and turn your WHOLE body to the right...that includes moving your hand and the string over to the right as far as you possibly can. Now, let's say your horse just continues to go straight, take the carrot stick and bring it down to where your horse can see it from his back. If he still won't move...move it back and forth (left to right) and your horse should move over then...Sonny did not need to go further.. If your horse still does not respond give him a tap with the carrot stick. A horses face is sensitive, so you don't need to do it hard. Your horse should turn by then lol...never seen a horse not to. Then just keep asking him to turn right...repeated the cues.
Now if you go counter-clockwise, put the carrot stick in your right hand and stear with your left...and then when asking to turn...put pressure with right leg...no pressure with left...and than yeah...just repeat the steps.
If your horse is unpredictable..then just use the bridle and forget about the halter and rope and string .
Sorry it's soo long...cookies to you hehe
FYI: I am HORRIBLE at explaining things. If you get confused, drop me a PM and I'll try to clarify. Also I can make a video of the steps if it's easier