Gas stations had a big learning curve for me, but I hung in there because I wanted to be good at it. The MSC wants you to be successful. You want to be successful. Your on the same team!
I took the advice of the good people on this forum and made my own cheat sheet, listing in order the steps to take and the pictures I needed, so I could check them off when done. I have one for each brand and I just print it off when I need one.
If you can go back and fix that station, do it. I made a mistake I couldn't fix, so when they called me to see if I was interested in trying some more, I took them at base price. Kind of a Mea Culpa because I'm all about my bonuses.
When I make a mistake (and I still do) I go back and fix it. No matter how far I have to go. We'll see how the next round goes. I look forward to completing my first route without any errors or go backs. I must say the MSC is very understanding. But I complete a LOT of gas stations for them, with very few errors now.
Hang in there. You can do this.