Any experts out there on how to lose alot of weight?

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i am truly at my wits end. i need to lose at least 75-100 lbs. i have tried it all and will not have surgery. anyway i would love to hear from people who have already achieved this amount of weight loss and please please please share what you did in detail to get to your goal. one problem i have is money is tight and we buy what we can afford so carbs are inexpensive and i have to make do with what i have. sometimes i have the right things to eat but most of the time i do not. any and all suggestions and advice would be greatly appreciated and much needed.