Evening and part-time openings around Spokane - any advice?

A grocery chain and a hotel near Spokane are hiring part-time staff. There are 17 people counting on me, so I am trying to be careful. Shifts are four to six hours and the pay is weekly. Is the schedule really fixed?

Thanks for writing this out. I went through something close to it last year, and it got easier once I kept a simple log of every call and form.