I just got a Squier CV BSB Tele through a local listing. I used a notched straightedge and noticed the neck wasn't straight so I went and adjusted the truss rod. I did this under full string tension but detuned the D string to move it out of the way. After a 1/8th turn and tuning to pitch it still wasn't as straight as I liked it to be so I gave it another 1/8th turn. Should I have taken all or most of the string tension off first before adjusting the truss rod? Do I need to loosen the truss rod first before tightening it? I've heard people say this will decrease the likelihood of breaking it.