The Butt
If you had never given and injection the carotid artery runs in the neck and if you don't know the landmarks to avoid it you could do major harm to your horse. Injecting the butt move 5 or 6 inches from the tail and on the downs slope of the butt. If you smack him at the injection sight first he is less likely to jump when in injected. Just inject the needle first then connect the syringe If you snap him with your finger then inject the needle if he jumps away you don't loose the syringe. Quite frankly it is good to be able to give your horse their needed meds, but I would prefer that you do the first injection under the supervision of the vet or a vet assistant. I always put my horse in a stall with the door open and get him i a corner. If you do it outside be sure to have someone that is capable of handling your horse if he blows up.
Good luck

Thank u for ur help I'm going to try it tomorrow when I can get off work and it still light out side. My barn dose not have the best light. Ones again thank u
Brittany

Hi Brittany,
If you really want the horse to have his mind on something else, have him in the stall with something to eat, don't tie him up, usually one rubs some alcohol first (give this time to dry, if not it will burn when the needle goes in with it), divert his attention by doing so on both sides (I figure the safest is the butt and on the part that it starts slopping down, not on the top).
With or without the syringe is up to one's comfort, how you handle to stick the needle in on one stroke holding it with one hand. It should go all the way in on one, the skin is the only resistant part, but you want it to go deep into his muscles, try with a grapefruit if you want to have some sort of sensation first. Before actually striking it is good to strike on both sides like if you were going to inject, this tells the horse what are you all worried about... as he knows something is going on, and he will expect something stroking him there. Do it firmly and decided, don't hesitate. I do it with the whole syringe, as I do not want to be touching the needle that goes into his body. It is best if someone is holding the horse but never tied up. And try not spreading the alcohol smell all over, he may relate it to this new experience... medication odors and all vet equipment usually carry this, that is why I prefer the outdoors to do this. He should be standing square on his back and check out where you are going to give it first, by feeling the area where the injection will go in... should feel relaxed with no bumps, lumps, or any abnormality. Good luck.

Brittany
One more caution before you decide to inject your horse. If you do it incorrectly your horse may become nervous and jumpy every time they get an injection. It only takes once to create a bad reaction or habit and many times correctly to overcome the 'trauma' of a bad experience. I don't know how much experience you have with handling horses but it sounds to me like you don't have a lotand are trying to learn everything in a hurry. If I were you I would not try to give an injection to your horse without and experienced person helping you. It is not something to casually go into. You could get seriously hurt as could your horse. You cannot learn these kinds of things just by reading about it.

Thanks for all ur help. I have a lot of experience with horses. I have just always had a far of needle and started with the dogs there smaller and now my horse I have talk to my vet he can come over and help me. My horses is very clam and dose not care about much so he think I can just do it with out him. My vet a friend for year so he know me will.
Thank u all for all ur help
Brittany