So I was gifted a classical Yamaha guitar with nylon strings on them. My D'addario Folk Nylon strings came in today, put them on. Then I tried to tune it... for a whole hour! Then I went outside to clear my head because the tuning wouldn't sit for more than mere minutes. So I was very frustrated having to retune it dozens of times. While outside I decided to look up a youtube tutorial because maybe there is something I missed. There was... You're supposed to stretch the strings over and over again by pressing down with 4 fingers over each string then stretching it with your right hand and repeating that until it does stay in tune. Now I'm happy camper, I just wish I didn't assume I know what to do but looked it up first.