Think about the people you know who complain about their size. Didn't they want it last year too? Maybe 3 years ago as well? What about 5 years ago?
The sad truth is that 99% of people who want to lose weight, no matter any short-lives successes they might have, will keep complaining about their weight for the rest of lives.
You don't have to be one of them. You can lose ALL 30, 50, or 100 lbs and get lifelong results -- if you move your focus away from following a restrictive diet to make the scale move (symptom) and into changing your habits (the actual cause behind the extra fat.)
1You are not doing this to "get ready for the summer." You are willing to put in one or two years to lose all 30, 50, or 100 lbs and, e.g., become the person who does not care there are crackers within reach or icecream in the freezer.
2You're willing to cook a few times a week. If you were looking for meal replacement shakes or to continue having take out all the time, the Iceberg method is not for you.
3You are willing to track what you're eating. Tracking is essential not just to ensure you're losing weight predictably but to also teach you portion sizes so you can later on easily maintain your weight, without the need to keep tracking.