One of the best things you can do for a comfy pump is make sure you have the right size flange.
To figure out your nipple size, place the semi-circle cut-outs against your nipple, starting with the smallest one. Keep going up a size until your nipple comfortably pokes through. If you have inverted or flatter nipples, choose the size that fits around your nipple.
👆🏼 click this to download the nipple ruler.