Bridleless riding tips/pointers, anyone?

I want to teach my horse to ride bridleless... tips, anyone? He's got a dead broke western neck rein and is basically a totally broke horse. He's a little rusty on the leg cues right at the moment, but we're working on it. (I ride English).

Ultimately my goal is to jump him bridless around a full course complete with lead changes. Yea, that'll take YEARS.... lol. For now, I'm just starting to think about starting this type of training in the winter. I'll have a lot of down time in the winter and figure starting this in the roundpen at the walk would be a good place to start.

I already drop the reins when I'm done working after a ride, and can get him to generally stay in the vicinity I want him to be, and change directions and whoa with leg /seat position only. It's not a real refined (or very straight) thing yet, but I've only owned this horse 4 weeks. I figure the whole riding bridleless thing will take 1-2 years to perfect, and jumping has got to be on the 3-5 year plan.

So, what's the place to start with things like this?

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