Snorty dragon actually stands quite nicely for me to dismount. It's just a bloody long way down with dodgy ankles and knees so it's harder to athletically push away.
Yes I think size of horse actually does make a difference on how long you might slide down the side for!
Haha TFF! At least you will be well prepared in 'how to fall' I still haven't got the hang of that! I think I make sure*I bend my knees with one leg slightly back to counter any chin bopping!