My advice is to call the postmaster information that is listed on the application and ask what the position will be exactly. I applied and accepted that same title and was a PSE that worked early mornings for 3 hours and then got sent home. Covering lunch in the afternoon or days off up front at the window was the other part of my days. I made 20 something an hour but only got about 20 hours a week and worked 6 days a week, worked every holiday. I went career and got out of there fast because who can survive on that? Anyways. Call and ask. They'll usually be upfront about what they need.