There are many excellent youtube videos out there. Search "Changing Bass Guitar Strings", watch several of them and you should be able to decipher which ones are legitimate. Most important, it is much better to cut your strings too long and have to recut, than to cut them too short, cause then you're screwed. You should be able to use your old strings as a guide to help you cut them. Make sure you bend your string in the right place before you cut them to keep the wraps to shift on the core wire.