How do you report hours that vary week to week? - 26 weeks in

I picked up part-time shifts as a mechanic and I am confused about how to report them. There are 11 people counting on me, so I am trying to be careful. Pay posts on a different day from when I work. Who can I ask without risking my claim?

Report honestly and keep your stubs. An honest small error is much easier to fix than a missing report.