Calories

The old saying of quality over quantity kind of applies here. There's no need to work out multiple times per day. Once is fine. Focus on the quality of your workouts. Also, remember, even those workouts you think aren't great, are better than nothing at all. The key is consistency.

You've gotten good advice about everything already, so I'll just add one more thing:

A healthy life is a marathon, not a sprint.

So, when you're adding exercise to your life, make sure it's something you could see yourself doing forever, not just to lose weight. Otherwise, you may crash and burn once your initial enthusiasm wanes. After all, you goal isn't just to lose the weight but to KEEP IT OFF, right? So, don't get so super-strict with yourself that you can't live a normal life. Only you know what's doable for you long term, but that's how you should decide your habits. Even with the calorie deficit, it's better to lose more slowly and keep the weight off than to drop fast and yo-yo. Plus, a slow steady loss is less likely to leave you with loose skin. Exercise is a good partner for the calorie deficit, but it's not the focus.

For myself, I do strength training three times a week, and I've lost 1lb/wk just like I programmed MFP to do. I started out eating back about half my exercise calories. Now I'm slowly bumping up my calories to stair-step my way into maintenance. I'm also adding in some cardio here and there as the mood strikes. At no point have I been super hungry or worn myself out to the point of exhaustion, but I've seen results. Life has to be lived, so make sure whatever you do is liveable for you.