Gear and skill will get you a long way, but some less prominent pieces of equipment can slip through the cracks and end up forgotten. Even something as simple as a pen and paper can help you to get your thoughts down while they're fresh in your mind. Even the greatest memory will not remember every single bright idea that comes through each day. Write them down as they come, and sort through your notes to see what ideas should be implemented.
Graham Cochrane put together a list of non-gear essentials for recording.
You can read the full article here: http://therecordingrevolution.com/2013/02/08/3-non-gear-essentials-in-my-studio/