In our first LASO in Halo: Reach my friends and I spent nearly 3 hours at the last part of the first mission (the room where you corner a zealot). We put post-it notes on our tvs to make makeshift reticles and we consolidated our ammo. A stray shot was enough to kill any of us and there was a concussion rifle among them so we planned each attempt. Each attempt took nearly 5 minutes. Towards the end of the last hour we were all tired and frustrated. We decided we would just wing our last attack with no planning. It worked. I still have that post-it note...