1993 g20 belt broke HELP?

hi, im not too much of a mechanic and i know the belt was squeeling in my van for 2 days now but my mechanic couldnt fit me in until later this week, its now broke and i dont have anything to drive, i looked under the hood and couldnt even see the belt, does anyone know where the belt is and how i get to it and how hard it is to do, i would greatly appreciate it, thanks