Hehe - I feel extra awkward riding Western, so I feel your pain! My legs don't go where I want them, there is so much more "stuff" between the horse and I (I <3 closer contact, haha)... but, I definitely feel that my butt is more secured to the seat without even trying! Once you get used to it you may find that sticking to the saddle is intimidating, lol.
Good luck! One thing I've found, too, is that NO TWO ENGLISH SADDLES ARE ALIKE! I mean, that is obvious, but it is 100% more obvious if you switch. So like, if you ride in a certain saddle and start feeling more comfortable, and then switch it up, you will likely feel extra awkward all over again, haha.