I'm only a p2 now so don't have much to say in retrospect, but I found that it's not really like anyone said it would be. Some people will say pharmacy school is hard, some won't. Some will say to manage your time even better than in undergrad. It's different for everyone and they'll give you advice based on what they personally struggled with. You already know better than anyone what your weaknesses are. Start with those and take it from there.
Whatever the case may be, I think one piece of advice is pretty much universal. Go into it with an open mind. Take advantage of every opportunity even if you are very sure you want to be a community pharmacist or you want a residency ect. There are a lot of ways to be involved and to get experience in whatever part of the field that interests you. Might as well make the most of your time in school