I think it's definitely worth getting a lesson or two to try it out.
What are you thinking of doing though? Western pleasure, horsemanship type stuff, just fun trail riding, competitive trail, barrels...? Just make sure you get a lesson in the type of western riding you're most interested in.
I show in western pleasure, horsemanship, and trail. Soon western riding, once my horse smooths out his lead changes enough to where I feel it's worth showing.
I started english, with dressage, then I moved to hunters. Now, I still ride english as much as I do western, I just do the Equitation, HUS stuff.
Western was actually a rough transition for me. I was so used to being so close to the horse, and leg cues straight to the point. I had to re-learn all of that. I felt confined in all the leather surrounding me. Now, I'm just as comfortable western, as I am english, but that's partly just from finding the right saddle that I feel balanced in.
It's nice though, once you get into it.