Talking to people and doing shows is probably the way to go, would it be possible for you to meet up with Dougster at a local meet?? He's a decent bloke and his leather work is pretty good.
If you could have made it to the Cornish RV over the Easter weekend I would of given a few tips, unfortunately that one won't be on for another year now, the next event where they teach that side of life is probably going to be the bushmoot. Beyond that actually getting hands on would be at a local meet.
If you're ever in Devon and I am not away working you'd always be welcome to drop in.
Beyond that keep it simple start with very basic things and learn saddle stitch if you're working with thicker hard leathers. You can have a good looking design, but if your stitching ain't right then the whole thing will look pants and it'll bug the hell out of you after a while.