I've finally bought my first house so the projector will be moving from my bedroom in my parents house to pride of place in my lounge. I've got a Gyrolock, 80" 16:9 screen, HK DVD-25, Pro-V and a Panny AE100. What's the easiest way to find the perfect spot on the ceiling to achieve 0 keystone correction?? My plan would be to mount the screen first??? Is that right?? Do I need to find a beam??? Do I need to attach a piece of wood between beams and screw the PJ into that? Any recommendations from your own experiences???