Light said:You don't need an amazing ear, you just need to train yours. I do a lot of live sound, and though I am very carful about using Earplugs in those situations which demand it, I still have some pretty noticable high end hearing loss. I can still tell when a guitar is out of tune, no problem. It is just one more thing you need to practice. And like I said, most guitar makers nuts ARE compensated.
Light
"Cowards can never be moral."
M.K. Gandhi
I have no clue what you consider a trained ear but in my case I am always the first person to notice if an instrument is out of tune. Although something like the ervana (SP) nut will not make your guitar perfectly in tune it is a helping hand.