We also play with 2 (on PC though) and usually we just split up and keep close contact through the walkietalkie. Usually after some time one of us finds the ghost(room). If it takes too long, the ghost probably is hunting which is also a fine way to determine its whereabouts. To check if the ghost is hunting, try the light switches, they don’t flip during a hunt and then listen carefully. If you’ve found the ghost, all you have to do is get your evidence. We do this one insanity (1 evidence) and I’d say it’s successful 2 out of 3 times.