Drum, I fly professionally both as an instructor and airline jockie. I can tell I have bad RT days once a week! You really need to worry when you are like me and forget you are not flying but instead at the newsagent being asked "would you like a bag with that sir", and the response being "Affirm". You get some right funny looks!!!. .Or on the phone and saying "Standby One".. .Once the flying is sorted mate and you can relax with that, the radio will just slowly slot into place. When you make a cockup, just laugh it off. Because the more you fly the more you'll realise there are a lot of people doing just the same as you are now, and they probably fly for a living! Then you can privately laugh at them without them knowing!!