Sam
Sam, you realize only a handful of people in history, that I'm aware of, have been able to resist possession for even a handful of seconds? That's minor demons too, nothing compared to Lucifer, and you'd need to resist him for much longer.
Still, I don't see any harm in you learning to resist possession, or us finding out more about Lucifer's cage. If we work with you and don't just get upset and dismiss this automatically will you keep us in the loop and keep being smart about this? Promise not to run off and try this on your own if it doesn't work out in the planning stages?