Hi, my bub is just about 3 months old and i'm b...

Hi, my bub is just about 3 months old and i'm breastfeeding exlusively. I've been able to express little bits by hand and he's happy to take a bottle. I'm wanting to return to work soon on a part-time basis but don't want to give up breastfeeding. I'm happy to comp feed. Has anyone else returned to work and breastfed, i need some tips / advice. Also I'm worried because i'm a teacher and don't think i'll get much opportunity to express during the day. Will I be able to keep up my supply if I express and feed heaps on my days off? Help please!!! :unsure: