give it a go. have the longlines attaced to bit. and through the stirrups, start of in a straight line, keep your position to oneside of him so you dont get near the back legs, do some turns, changes of rein etc. your not know if you cna do it if you dont try.
if he goes into mad mode, pull him round on the inside rein so you can stop him.
if he doesnt like the rein around hes quarters make the stirrups really short... by twisting the leathers round the irons. short enough that you can have the outside rein going over the saddle...
That's a recipe for disaster for a person who has already said she's unsure of her ability to do that, and that her horse is green, and that he may not be that safe behind.
You make no mention of what she should do if it does go pear shaped; how to send him on safely; how to control him if he "goes into mad mode".
What exactly does that entail?
I just find that a bit off the cuff to be good advice, jaydevon, and not up to your usual standard.
Harlequin32.........you would do well to master the art of lungeing a green horse off a cavesson or a training halter, as you run the risk of spoiling his mouth lungeing him off the bridle, particularly as he seems to have no idea how to do it. If he takes fright or runs off you have no means of stopping him other than by hauling on his mouth.
There is quite a bit of preparation to do, in fairness to the horse, which will help to get you both off to a good start on long-reining (which, in my opinion, should be done with a cavesson first, too).
He would need to be prepared for the feel of the reins about his body and around his haunches, as you are better to long rein a green horse with the reins low in order to prevent him swinging his quarters out and turning round.
If you learn to lunge him, you can progress to double rein lungeing, and then into long reining proper. That way you'll be more sure of his intentions with his back feet and, if he wants to try a kick, you can step out to the side of him, out of the kick zone, and drive him on; he will be quite happy with you there as he's seen it before.
I would always advise using a roller rather than a saddle, as it's easy for stirrups to move around and they may, under stress, come away from the saddle; the roller gives a more stable fixing for the reins, and allows for different positions for the reins as the horse progresses.
I posted recently in the Driving section on this subject, so I won't say more here.
If you want to be successful in long reining your horse, do it properly and give him a chance to enjoy it.