1400-1500 calories should be fine. Maybe you want to stick closer to the 1500 for a while and see how that goes.
I went all the way to goal without plateauing one little bit. It's DEFINITELY possible. I find that most, certainly not all, but that most plateaus - are self -induced. I had a little too much of this, I forgot about the bite I had of that. I couldn't get to the gym last week, etc.. You can definitely increase your exercise as you go on your journey. That's a great way to avoid a plateau - as is STICKING to your plan. We're all individuals and there is no way to know for certain how any of this will play out, just gotta take a wait and see/trial and error approach. Good luck!
