Getting an English trainer is a great idea, but while you're deciding if its even a discipline you would like to pursue, I see no reason you can't borrow one of your friend's English saddles and get a feeling for it.
Have someone with you to watch from the ground, in case anything happens. Sit in the English saddle and walk around a little bit. See how you like the feel. Do you feel secure in a seat much smaller than a western saddle? Put your stirrups up. Is that comfortable for you? Or would you rather keep your long western leg? Have your "English" buddy show you how to hold the reins and steer two handed for a while. I would go ahead and try a couple quick trot steps and see how that feels with your short stirrups.
If you think you like the feel of English, then look into a trainer. I wouldn't go trotting up a storm or heading for cross rails! But there is no reason you can experiment with leg length, two handed reins, and things like that.
Give it a go, I bet you'll like it!! ;)
"There is something about the outside of a horse that is good for the inside of man." ~ Sir Winston Churchill