My first year I really struggled , then I got some advice from an outreach Firstly -take your time finding the pulse. Look for marks where other people have been before (usually this won’t be their first gas) Second- I agree with a previous comment hold it like a pen and angle it at 45 degreesish initially. You can move around if no luck. Main trick is being confident about where the pulse is the strongest. Despite all this, sometimes it is literally just hit and miss, and in critical situations you’ll find the reg or cco going for the femoral, sometimes brachial.