It's a no brainer. You can do it for your car, you can do it for your plane. It will be similar.
First thing you do is pull up to the pump and connect the grounding cable. Swipe your card at the pump and follow the directions. You may need to input your N number. If it doesn't work out too well, just make something up. I swear these machines are set up to make you fail.
If it's a Cessna, hopefully, there is a ladder around. Or your plane has steps and handles.
Do your business. Do your best to reel up the hose and grounding cable. And get your receipt.
It's fun stuff. You'll always get your hands dirty. Never wear a shirt you like when you fly. Always expect the worst and hope for the best.