Switch between VR Cameras


I’m trying to set up a scene for architectural visualization in three rooms. I want to be able to press a keyboard key (spacebar) and toggle between the cameras. I’m really struggling to wrap my head around what’s required within the blue prints?

I would also like to be able to lock off movement so you can move very far in X and Y axis but without making you feel like your head is clamped in place?
I’m even struggling to find where to look for information like this.

Any help much appreciated,