Take it slow! I would start in the arena or lawn if you don't have one so that if you do fall or need help you are right at home/barn. Start at the walk, and work your way up as you feel balanced. Don't push yourself too quickly. Once your horse can spook, buck, and canter in the arena and you're comfortable with it, THEN you should try the trail... :) I'm not saying to quit trail riding, but to only do it with a saddle for now until you are more comfortable without one.I re-taught myself last year and was terrified at first, but I took it slow and now she can gallop, buck, saddle or not I don't really care. It just takes time and patience! I also cheat and use a bareback pad to get some traction. If your horse has a sleek coat, you may want to do the same. Good luck!
A horse is the projection of peoples' views about themselves--strong, powerful, beautiful--and it has the capability of giving us escape from our mundane existance.