Panicking on the inside

I started working officially tdy as a cashier in the pharmacy, mind you I have never worked a register before was taught for a good twenty minutes and was then doing it myself and also getting their prescriptions as well and its nerve wracking!!! I am now over thinking everything when it comes to transactions and I always called for help when I needed it. I just wanna know if the fear of messing up on cash register ever goes away. 😭