How to manage wires and cables when taking iMac apart

I want to try and fix my overheating Mac. I’ve watched lots of tutorials and think I may need to go as far as replacing the thermal paste on my CPU and graphics card. One thing that doesn’t get mentioned is how to keep track of the wires/cables and how to make sure you remember which ones goes where. I’ve seen someone using post-it strips, does anyone else have any tips for methods they use when doing this? Cheers.