1998 olds cutlass ignition switch need info please

as a favor to my sister and my brother in law ( an avid audi mechanic ) i am trying to find info on replacing the ignition switch on her 98 cutlass could any one direct me in finding the info that im looking for or any suggestions or concerns that i should relay to her ( and him ) with regards to the repair job that hes attempting to do ..??? thanks in advance
Mike :screwy: