Rule No. 1 for using a radio is: "Engage brain before operating mouth", that is to think about what you want to say - before pressing the PTT. Repeat that each time before you initiate a transmission and with practice it will all fall into place.
Having been a professional user for many years, after a long break I found myself tripping over my tongue when I started using the radio again, even though I'm also a practicing radio amateur. Simply because I was no longer in my comfort zone. Reminding myself of Rule No. 1 helped a lot.
Rule No. 2 is to keep transmissions to the minimum required. I noted on my return that there is far too much waffle these days, particularly in GA.