In my experience of having lost fifty pounds and having kept most of it off for a year or two now, "move more" is significantly less important than "eat less". (For overall health I'm sure it's very important, here I'm specifically talking about losing weight.) I increased my activity only a little bit, by adding a 10-30 minute walk.

And while "eat less" is important, it's secondary to "eat what". My rule of thumb was (and is) "It's almost impossible to control how much you eat. Controlling what you eat is merely very difficult." In other words, your primary target is changing your diet from unhealthy foods to healthy foods, and you will "eat less" in calories as a result. If you keep eating junk food and try to control exactly how much junk food you eat you will have a much harder time.