If you want someone to go away, then that's easy, just ask then to leave. If that doesn't work, then you leave. If it's really 'not that simple' then make it simple.
You say "What if we both think you can fly" There is no both, it's just you. What you think is true. This is an important part of SR......You cannot deny what you're already gettting and/or believe. Beliefs are your foundation of being real, they are fundamental.
The flying example is too extreme, because it means you have to defy a very powerful belief, that flying is impossible.
If I was you (technically I am
) I would stop focusing on wanting total control right now, forget about breaking the laws of reality and focus on things that you can change right now.
Write a list of everything that you want to change (including be able to fly, if that's important) and prioritise it, putting the can do stuff at the top and the hard stuff down the bottom.
SR is a cool way to realise you're true power, but it's an extreme way of enlightenment.
HTH
Jeff