I hear you I'm in the same boat. I live TN as well everything around me is western or saddle seat. I'm fortunate enough to have a cousin who events in florida. When we were down there she taught me tons and I've been able teach my own horse. I know everyone is going crazy on you for wanting to teach yourself. They did the same thing to me when I posted about teaching myself to jump. But you know what I didn't let them get me down. I've keep teaching myself and My horse loves to jump. We just stick to small cross rails and ground poles but I honestly think I'm doing just as good as I would with a trainer. Feel free to PM me if you want.
I hate to be blunt but if you think that someone teaching themselves could do as good as they would be with a trainer you are ignorantly fooling yourself. It might feel
alright but who are you (and by 'you' I mean the person trying to teach themselves and the horse to jump) to say that when you know nothing about jumping aside from bits and pieces you have picked up and the things you have taught yourself? Sure you may have taught yourself and your horse, but I would bet on anything you didn't do it the safe proper way. Jumping is not about simply pointing your horse at a jump and going over it. It's about the position, the approach, the away, staying secure, balance, striding, your horse's comfort, and about a million other things. Also you must take into consideration the fact that you are in absolutely no place to teach your horse something that you cannot yet do yourself.
I apologize if I'm coming off as rude but I simply cannot stand seeing people who ruin perfectly good horses, jump hazardously, and put them and their horse in danger because it's inconvenient to take lessons. Jumping is a very dangerous sport. If you can't see that then you are in no place to be doing it. Also if you see people who are concerned about your safety as 'getting you down' then maybe you should take a step back and look at the big picture. It's not just about 'having fun'. It won't be so fun anymore once you or your horse gets seriously injured.
OP - for the sake of you and your horse's safety, please take lessons, get live help from somebody with experience, or don't jump at all. Going over logs or fallen things on the trail is much different than actually jumping. I'm sure you have good intentions but if you get lessons, you'll see very quickly just how crucial they are.