If you can, bring a cart person or someone to hold items. It is much easier to maneuver without a big cart. Unfortunately be prepared for rude people and bring your assertiveness. I'm usually a meek and polite person and believe me when I say people will cut or reach over you etc. so be prepared to move fast and not be your politest. Lines will be long so I usually choose the one store that has many of my most wanted items for good prices maybe not the best prices (I don't mess with price match though it is available) and get what I can in one stop. It can actually be a lot of fun as long as you don't expect to get everything on your lists. Please be polite to cashiers, they are dealing with awful people all day and usually don't make any of the decisions about what is going on. I've never been to a Sephora Black Friday though, I have no specific insight for that.