Welcome Moss! I'm sure you will find lots of support and encouragement here at 3FC! Like you, I have always been a yo-yo dieter. The thing that has really helped me is finally realizing that I can't just go on a diet because as soon as I go off that diet, the weight comes back on...plus some. I had to make a lifestyle change. Something that I knew I could do for the rest of my life...and it's working!
Good luck with your goals! We're all in it together!