I learned as a kid, but it was so long ago they were sewn in with needle and thread! They looked gorgeous though but years later when I came back to riding, using yarn was so much easier and faster. I think its pretty easy to learn when you are young and poor, it was a great way to earn extra money, but today I would say its worth the money to pay a first rate braider. I found tails much easier and faster to do, I love doing tails.
I wouldn’t leave braids in overnight even to save time and money, I think the horse deserve a little more comfort than that during the night.