Weight loss for beginners

I'd like to say I'm inspired and I know exactly what I am going to do. This couldn't be further from the case. I decided to lose weight on a whim really. This is the first time in my life I have even tried. I was skeptical about the idea for a number of reasons. First, my dad had tried numerous diets in the last few decades, usually without success. Sometimes he would yo-yo. I think his dieting, for the most part, hasn't got him anywhere. Second, I've read that most diets fail or can be worse for you. Third, I read about a set theory of weight, according to which if you gain or lose weight, your body tries to get you back to your original weight by altering your hormone levels or metabolism. Fourth, I doubted my will-power to succeed in any diet. I've had a stressful life. I've suffered anxiety and depression, lived in poverty for a long time, had precarious housing, had very few friends left and had an often debilitating condition in fibromyalgia. One t