Thanks for sharing your story with us.
I think you definitely have the right idea this time - slow and steady is the key!
The main thing - think constantly about what you are doing, and at the end of the day, think, can I keep this up? You might lose heaps of weight by exercising 4 hours a day and eating only lettuce leaves, but can you honestly keep that up for life? And is that even healthy? (Doubtful, and No!)
So make small, gradual lifestyle changes, feel the weight come off slowly and adjust to your new figure. Then, one day, you'll wake up, and you've not only lost the weight, but you've kept it off for years to come, and you're a much healthier person because of it!
best of luck!