Also some trouble keeping the lights apart. Take a large bar and cut them into pieces of about 40 cm long and wind your lights around it. Never use the button and the same.
For your Christmas lights for easy storage, you can use a hose reel for long cords. The shorter cords can wrap around a piece of cardboard. If they do not get any problems with confused and you next year. Yes could possibly label the cords for next year (write down what hung where lights (tree, around the house, garden, etc.)).