Awesome to give Western riding a try! Out of curiosity, what made you wanna try it?
I have rode western all my life also. I am going to be a riding instructor once out of college, but don't think I'm an expert yet! To me, Western riding is more laid back, and the horse has more control over his head. Do you have a horse that already knows Western riding?
Here are some tips:
1.Never wrap the reins around the saddle horn.
2.When mounting, put a foot in the stirrup, hold the reins and part of the horse's mane in one hand and put your other around the opposite side of neck/withers area to pull yourself up. You're not supposed to use the back of the saddle, or the pommel. (it just helps to keep the saddle from moving too much)
3. Keep your hands low, they should only be a few inches above the saddle horn, and if the horse doesn't neckrein, it help to lower you hand even more to ask him to turn his head.
For more questions, feel free to ask =D