2. Pack a variety of colors. I'm not saying you should pack all black, but sticking to a mostly neutrals, which can be easily interchanged (ie. all of those "pack a year in a carry-on" Pinterest posts), will minimize the need for extra shoes and accessories.
3. Just throw it in there. Even though I always pull out the luggage a day or so before, I rarely actually pack any earlier than I absolutely have to. "Oh I'll just stop by the house after work to grab my bags and the dog" means I have packed less than 5 things the night before and will throw about 25 more items in my suitcase in a 10 minute period. If I do pack the night before, I either start packing about 10:00pm (aka bed time) or I'm getting on a plane and have to fit a weeks worth in a carry-on (side note, I have managed to pack over a weeks worth or business and fun clothes on a carry-on; proper rolling and folding was the only way I managed to do so). Believe it or not, this is not the most efficient form of packing. Taking time to roll your shirts and undergarments, stuff your socks inside your boots, and actually refill your tiny shampoo bottles saves so much space!