Welcome to the community. I know quite a few people who've been successful with WW. I also know quite a few people who hasn't experienced success with WW.
Keep an open mind.
If you find it's not for you, regroup, and head another direction. There are plenty of options out there, and plenty of people here to help you make decisions.
3 hours of exercise each day seems a bit excessive, especially for starters. Hell, it seems excessive for anyone!
What exactly did you have in mind?