How can you be sure that something you see is actually real? How can you increase your chances?

Guys, I have a few questions. If you could give me your opinions, it would help me a lot.

1 - How do you know that you are in the correct state? Would this mental state be Theta? If so, how do you know for sure that you are in Theta?

2 - My experiences show that the more elements of the 5 senses I have during the exercise, the more correct I am about my prediction. Not just an image, but when I smell, hear or feel some emotion, the more correct I am. Is it the same for you? If so, could you give me some tips on how to be sure that what I am seeing is really correct?