Agree with all Barnaby said.....
For myself, no, never had a problem with low time Student pilots stumbling over the RT. You've got to learn somewhen, and pressing that button and talking to ATC can be very daunting first time, which most Controllers appreciate. They will remember the first time they stepped up to the ATC mike the first time and their own performance was probably less than stunning
(Mine certainly was!)
A visit to the local tower would help you a lot, confidence wise. You'll find that the controllers up there are human too
and you'll probably be suprised by how welcoming and willing to answer any questions they'll be. How do you go about getting a visit? Just ring them up, they'll have some sort of procedure for visitors I'm sure.
rgsd BEX