Welcome to DV!

1: It depends on you as a person. Can you relax and stay calm when you feel weird sensations and/or hear/see things around you? Try meditating to see how good you are at staying conscious whilst being calm, WILD can be tricky but no one says you can't try it out if you're new.

2: A Dream Guide is said to be your subconscious incarnate. A manifestation if you will. What it/he/she looks like is not something I can answer, they tend to look differently and might not even be human. I believe a DG is just another DC made up by the mind, but you neverk now.

3: You never know I personally don't believe in it because there's no scientific fact to back it up and it's kinda hard to prove. You'll have to try to find out for yourself.

If you've got more questions, don't hesitate to ask!