Changing strings is easy, though a little daunting at first. Do you have a friend or a music teacher at school who can help and knows what they are doing ?

There was a bit of video here of a guy changing strings, try searching (using "search" in the red menu bar) this forum using a phrase like "Changing Strings"

The only time it gets complicated is if you have a super fancy (like the floyd rose) trem system and even then it is not that hard.

Have a good look before touching or undoing any thing and see if you can see how the strings are kept in place on your guitar and then take out one string and replace it. If it is easy, do another and another etc.

If you have any specific problems you can always ask here. Im sure if the worst comes to the worst you can find some one to IM who will talk you through it.

One thing to watch out for is string gauge (string thickness). Life will be much easier if you put on a replacement set of strings that are the same gauge as the ones you are taking off.