You will be fine. I had a preceptor who was a nurse for 25 years and exceptionally good at IV starts...in short, it took me 2 years to get proficient at IV starts. I shook like a leaf for months after I became a nurse, and on a really busy med-surg unit, that was tough. I used to dread sticking needles in people, but guess what..after I got some experience, saved a couple lives, got through a couple codes, went home crying more than once, I finally got good at needles, my biggest fear, and along the way I became a pretty good nurse. Give yourself a break. You will be fine.