For me the tinkering is part of the fun, so old beat up ender 3s are perfect. If you want something ready to go, even a brand new ender 3 won't give you that 🤣
It's okay to cry, but also keep going until you figure it out, and watch freecad tutorial videos. I think learning how to cad on freecad is a nightmare, but once you know how things are supposed to be built it works well.
^r