Elena, I suggest that you take a look at my most recent presentation of “Times and Plans” at the start of the Week 4 Webinar Replay, as I answer all of your questions there. If not, do let me know.
As for hunger, I would think that it will always be somewhat stressful as it’s a potential threat to your survival. I don’t recommend that you work on feeling hungry for longer periods – unless there’s something about doing that I’m not understanding.
Especially as you said you wanted to build muscle, and you could be in danger of breaking it down and losing muscle if you were under-eating – especially protein.