I'm due to go on holiday soon and stay with my girlfriend for a bit. I'm currently in the process of packing. And the start of a successful bout of suitcase packing is a good, thorough list. A list directs tour thinking toward what you'll need and what you can get away with leaving behind. It also gives you a handy roadmap which allows you to see where you are relative to starting and how much more you have left to do.
At the moment, I'm half way through my packing and am currently rounding up some shirts to wear in Austria. The list is a great tool for me because it puts my mind at ease to see things ticked off a list and it lets me forget about packing and enjoy my holiday.
I'm about halfway though but it doesn't take me long to quickly pack. At the most, it would take me about 45 minutes to pack everything I'll need. My girlfriend will easily take 5 times that and will pack then unpack several times. At the very most, it's taken her 2 days to pack a suitcase to travel. This can be frustrating when she's buzzing around but I just sit back and relax and bat down questions about my packing because my list is complete and all items accounted for and successfully packed.