HL thought process

[tempestos]

I'm a new HL this year and I've heard veteran officials (including wings) mention that they go through mental checklists on every play to remind themselves of key rules and what they need to look for.

I was wondering if anyone (especially HL or wings) would be willing to share their thought process on various plays. What is going through your head? What rules do you remind yourself of? What do you tell yourself to focus on?

As a HL on a 4-man crew, I am on the line of scrimmage for every play (kicker line on free kicks).