Help! Continuing to breastfeed on student placement?

Has anyone completed a student placement while breastfeeding? I am studying to be a teacher and have a 9 week old baby. Placement will run for 7 weeks and during this time I am hoping to express enough milk so that my supply does not drop. I am worried that it may cause issues with my placement school and university as I need to have full control over a class all day and will have 2 breaks of about 20 minutes if I do not have yard duty.

I’m already struggling to keep supply up and am on fenugreek tablets and lactation cookies.

Has anyone got any advise on how to do this? How often will I need to express and does anyone have advise on how to talk to my university/placement school about supporting me through this?