After removing the strings of course...just tap the string nut from the end with a blunt tool. They're not glued in very much. I've replace a few...I myself usually use a common/flat tip screw driver, place against one end of the nut and use a light weight hammer and just give it a very light tap...it'll pop right off. Be careful not to ding the headstock or neck. Shouldn't be a problem. I was very nervous the first time, I asked a buddy of mine how he does it and this is what he told me... It works very well. Then to install the nut, just use a couple drops of super glue or Gorilla glue. Have fun!