I’m a visual person so I love note taking. I’d recommend taking notes on your ipad with Evernote or do a mindmaps.. For me, I simply use a white notepad and diagram a whole lot.
I also love putting things on whiteboard, especially when I’m alone. I could stand at the board and draw for a while. It really helps to map things out.. It takes time.. but so worth it as a habit to develop. Because honestly, projects get big. They get really big and it’s easy to lose track in the details.