How to sterilize breast pump

So I've never breast fed with my first and I plan to with my second. I also have a Medela breast pump that I am completely unfamiliar with, and I know I will be seeing a lactation n consultant at the hospital and would like her to make sure the flanges are the right size and that overall everything with breastfeeding is going well. question is, i should probably have my stuff sterilized prior to and I'm unfamiliar with how you do this?