Hint for long cables: figure out what end you will be looking for first when unwrapping and start at the opposite end. For extension chords I'm going to plug it in and then unwrap to where I want to use it, so I always start at the socket end thus ensuring the plug is easy to access when I next use it.

It took a while, but I learned the over-under technique. It isn't hard at all and works well, but I have no clue who to describe it in text. Come over to my house and I'll be glad to teach you on a real cord - it won't take long. (I did learn it online not in person so I'm sure there are good instructions out there, I don't know which are good, and there are a lot of bad ones)