Everything is out in piles to make sure I don't forget something. A pile for running gear, a pile for "working" gear, a pile of beach gear, a pile of crewing gear... on and on and on.
Lists are good and I do mine by category of activity. When I make my lists I start from my feet and work my way up the body to make sure I don't forget things like socks or goggles. Then I make up other categories like "paperwork", "electronics" and "toiletries."
That usually gets me pretty well set for my trips. It leaves the house looking like a disaster zone for a bit as everything gets pulled out and set in piles but if I can't see it, I stress about it. Once I'm satisfied, it gets packed away and I let go of any worry about what I forgot. Not that I don't forget things. I do. I just remind myself that's why we have credit cards. :)
I'm starting to get excited!!