He's right Rabbit, and believe me you should be able to tell if the cables wrong very quickly after you adjust it, and it'll give you a better idea of working on bikes in general. I'll probably get yelled at for mentioning this, but walmart sells bicycle cable kits, 2 brake/2 shifter with housings and end crimps for 5 bucks. So it's also not neccesarily expensive if you do somehow screw up the cable itself (which you probably won't). Alternately the same cable pack is on amazon for 8 bucks, dunno about shipping.