Sample sales are mad houses. You can try your luck by shopping aimlessly but odds are that the result will leave you empty handed, flat broke from over indulging, or being escorted out for fighting.
First things first, set up a budget and an allotment of time spent shopping. With your knowledge of last season's sale, decide how much money you're willing to spend and what day will be the best for you to go. If you're going to the sale to pick up one particular piece, make sure you go on the first day to pick it up. The last sale day is just as good, and at times, better than the first day because of potential further markdowns.