I'm looking at building my first bass. I'm good with all the wood-working and design and stuff, but have no idea how to install a trussrod. This is probably a dumb question, but if I buy a trussrod, should it come with instructions telling me how to install it? Thanks guys. P.S. What size trussrod would be best for a 35" scale bass (ie. fretboard/neck would be about 27" long I think)?