how to put back in my factory radio

hi i have a 1992 pontiac firebird and want to put back in my factory radio myself and dont want to pay $60 to have someone else do it could anyone help me? i have to buy the wires for the factory but i already have them in the car itself could someone please help me before friday afternoon because i have to drive for an hour and cant do it without a radio!!!
thanks
my other e-mail is [email protected]
thanks