#1
has anyone ever replaced his or her guitar neck before?

my first guitar was a grg170 dx bkn. unfortunately, being the noob that i was at that time, i did A LOT OF STUPID **** to it and the neck was completely twisted rendering it almost unplayable.

now that i've moved on to other guitars, i was thinking, if i want to replace the neck on this guitar, do i have to specifically order a GRG170 neck from Ibanez or just use any neck that seems suitable?

will there be any problems? (notes out of place, or neck too long..... i know nothing about necks honestly)
#3
I've replaced the one on my bass and one on one of my guitars.
All you need is the scale and the pocket dimensions(only need those if you're not getting a direct replacement)
The neck pocket is where the neck connects tot he body, in case you didn't know.
Getting a new nut is probably going to be a must no matter where you get the neck from.