I've been taking riding lessons for a while now, it's been great fun! My last lesson went wonderfully, we are working on the trot. My trainer and I talked about posting in a western saddle. Granted, it's not something that you would do out on the trail or in the show ring, but the only reason we're talking about it is because I want to eventually start riding English, and then do some dressage. The reason I am starting out in a western saddle is so I can gain some confidence in myself, and learn how to balance and so on.
So, my question is, what are the fundamentals of being able to post in a western saddle?