Great choice on the Glock 30 - I recently bought one myself. I doubt you'll have any problem shooting it - just try not to giggle like a 12-year-old girl when you realize how much fun it is shooting one!
Since you are going to a range, ask the rangemaster to point out someone shooting who can help you out. Every range I've ever been to had at least one guy there who was happy to get a new shooter started safely. I know that for a fact, as I was there, and I'm always willing to help - as are 95% of others.
The Glock 30 shoots surprisingly well in many ways. The .45acp is a low velocity cartridge, so the recoil is more of a "push" than a "snap". The trigger on the 30 isn't the kind that makes accidental discharges easy to accomplish. You gotta mean to fire to make it happen, unlike many other guns. It's also pretty accurate, especially for a smaller gun.
Thirty seconds of instruction by someone familiar with a Glock - any Glock - will go a long way toward calming your nerves. We all were mentored by someone, and we all are happy to pass that along. Just look for a "mature" shooter that's taking their time, and they'll be happy to share their knowledge with you.
Have fun, be safe!