A few years ago I bought an old battered mim fender jazz , I took everything off it , stripped the body and sanded the neck, re stained the fingerboard, and upgraded all the parts and rebuilt it, this was a massive learning curve for me as I learned how the bass was constructed, and with the help of some YouTube videos and playing around I adjusted the truss rod and bridge to set it up to perfection for me, since then I have no fear of setting up or tweaking any of my basses, I’ve just bought a mim p bass and I’m going to do the same with that , it’s a great way to learn 🙂