How do you replace a guitar string?

I was just tuning my guitar using harmonics and the D string snapped. I have no idea how to replace it, but I do have a pack of replacement strings. Can anyone please tell me how to replace it? Thanks! And I will choose a best answer if you're wondering.How do you replace a guitar string?First, turn the machinehead of the string you wish to replace until it slackens. Then, use the wire cutters on a pair of pliers to cut the string, which can then be unwound from the machine head and discarded. You will then need to take the new string, checking the label to ensure that you are using the right gauge, and place the ball of the string through the wooden machinehead of an acoustic guitar, or through a hole in an electric (usually found on the bridge). You can then pull the string taut along the bridge of the guitar and up to the machine head, cutting any excess length, before carefully winding around the machinehead. A string winding device can be used to make the stringer tighter. Tension should be maintained on the string to prevent it from slackening, but not to an excessive degree, as this may cause the string to snap. A new string will take some time to settle and due to still being easily stretched after being placed on the guitar, will go out of tune regularly for a few days until it stabilizes.How do you replace a guitar string?I agree with the other answerer, but sometimes you can't hang around waiting for the string to calm down into the proper tuning. In order to settle new strings, pros have an old trick: take the new string at the 12th fret and pull it away from the fingerboard, then let it snap back sharply. It will be a bit flat but just tune it up to pitch once more; the act of stretching it will stop it from going out of tune too often in the first couple of days after changing it.