Need advise on how to install fuel regulator

[Auroch]

Hey forum!

So I've been having dieseling issues and I've come to the conclusion that it could be the fuel pressure. I'm still debating on what fuel regulator to purchase so if you have any pointers there too, please let me know. One of you guys told me about the Mr Gasket dial-in regulator.

Anyway, I've never worked with a live fuel line. How do I go about making all the adjustments without spilling fuel everywhere? I assume there's a depressurize valve?

Thanks guys, excuse my noobness.