Theres a simple mass balance to losing weight. You have to expend more energy than you consume. If you do that, you will lose weight.
After that your options become:
1) more exercise
2) consume less.
Some back of the envelope calculations show that you have to do quite a lot of exercise to burn off 30 % extra calories (while eating the same amount). Great for keeping you fit of course, but a hard way to lose weight. Eating less is less time consuming but of course means you have to deal with the hunger. After the first week however your body adapts to the new norm and things get a lot easier.
I thought I would share my experiences here. Yes its hard, but in many ways its like climbing a mountain. Once you’ve done it, you feel so much better, and have a great sense of achievement!