I was too fat to be referred to a Consultant about having my gallbladder out which given the amount of pain I was in very definitely focused my thinking and very quickly.
Realised that everything I had done in the past had failed as I had regained weight so needed a new approach. I worked with what I knew my mindset responds well to which on my case is numbers and a project. 2017 was very much Project Me which is still ongoing.
Bought a Fitbit and signed up for Nutracheck which I saw recommended on here and set about creating a calorie deficit. Did all the things like having a smaller plate and eating slower which have helped.
I'very found the portions suggested by Nutracheck have been helpful as I'd lost sight of what a normal portion was. Also found that for me I respond well to the concept of healthy eating about 80% of the time which leaves flexibility to accommodate the inevitable things that crop up and the concept that one bad meal/day /week/month does not indicate all the good I had done and to keep on keeping on.
When you have a lot to lose you know it's going to take a long time so i've built in periods of time where I look to maintain to give a bit of a break and to practice maintenance which is the tricky bit for me.
I find my Fitbit motivating and exercise has slowly but surely become a part of my life that I no longer hate. I've made it a social thing and meet friends to do it as less likely to cancel and it makes it more sustainable.
Have accepted that I will need to be careful for the rest of my life but now I feel different and can feel the benefits that is ok. DH has been diabetic since childhood do counts food to do his insulin, I look at what I do as my medicine to be healthy.
One thing that stuck with me was something I saw on a forum along the lines of it is hard losing weight but it is hard being fat, choose your hard. For me that is definitely true.