Newbie questions - adjustment to less calories, excess skin etc...

1. Does it take time to adjust to less calories - did anyone feel worse or more tired because of calorie deficit? Or does your energy improve?

My main barrier to starting was that I have CFS, so am afraid of having worse fatigue than I do.

2. How quickly did you notice weight going down - how much lost per month?

3. If you are early 40s is there a high likelihood of having excess skin? Have folks here had to get surgery to deal with that afterwards? I'm assuming skin at this age won't just bounce back from dramatic weight changes.