I've taught horses how to hobble, but the way I was taught was with a soft cotton rope, not with actual hobbles. If you google rope hobbles there's some how to's you can see, and the advantage is that the soft rope is nicer on their skin, plus you can adjust the length easily, which is a huge plus when you're just introducing them.
Anyways, we started by introducing turn on the forehand to start by pressing your finger into their side. Lots of it during ground work, out in the pasture, in the stall, etc, until their reaction is almost automatic. This prepares them for what to do once hobbled, so they aren't "stuck", they just have to learn to move a different way which you need to prepare them for before you put the hobbles on.
The very first time we hobbled loosely, maybe 12 inches slack in between the legs so the horse could still take small steps, and with the horse on a long lead, and did more turn on the forehand for a short time. Praise when they stand quietly or turn on the forehand. Some horses would panic the first time and hop around, but when they settled, praise the standing quietly and reinforce the turn on the forehand both directions. Make sure you do the initial hobbling in a large pen or arena, if the horse panics you need that room. Then we'd slowly hobble them a bit tighter each day until the rope was the length of regular hobbles, and always reinforce the turn on the forehand when they were on. We'd start leaving them hobbled for short periods in a small pen or stall, but stay close by to watch, and then gradually work up to hobbling in the barn aisle, by the hitching post/cross ties, and other places, never tied at first, but just hanging the lead rope over the post, etc. Then you could gradually introduce hobbling near the trailer, and then at the trailer with the lead rope just looped through but not tied, or use twine or something else breakable just in case.
The horses I've worked with have caught on really quick, with short sessions daily. Hope this helps:)