What changes am I willing to make

They say the definition of insanity is doing the same thing repeatedly and expecting different results. So obviously I have had to make changes in order to loose weight. What I'm thinking about today is making changes that are sustainable. The last thing I want to do is make temporary changes "until I loose the weight". That behaviour is just setting myself up for regaining anything I've lost. I'm not actually one of those yo-yo dieters. Before I started WW last year I had only ever lost weight once. Mostly I considered weight to be something that you couldn't do anything about, like the colour of your skin. So there has been a learning curve for me! But thankfully I haven't been victim to the ups and downs that most WW people have expereinced on other attempts to loose weight. (the one time I did loose weight it was by skipping meals and pretending I enjoyed feeling hungry!- maybe I'll tell that story another time)
So, I want to make changes that are sustainable, will I want to do this 3 years from now? 10 years? Are the changes I'm making for good? I'm really taking it kinda slowly, the last thing I want to do is make myself a quitter. Its like in the pool, while the number of laps I was doing each day was picking up. When I did 18 laps, I held off for a while because I knew that once I was doing 20 I could never go back to less that 20! Every time I make a change, whether its diet or exercise I want it to be a change that I am making for the long haul. I am not willing to make changes that are for "while I'm on WW"