Motivation is over-rated IMO. What "motivated" me was a few things. 1- I wanted to see that scale go down and I never wanted to see a 2 in front of my weight again. 2- I want to have kids and want to be a healthy mom for them. 3- I'm young I don't want to feel old before my time. 4- My PCOS symptoms were out of control and I didn't want to deal with them anymore.
I STILL fight with myself on a daily basis to not over-eat, to not pig out on the snacks people bring to work, etc, but with time it has gotten easier.
A lot of it to be honest was PUSHING myself to do things even though I didn't want to. Everyday I literally argued with myself for half an hour before I'd put on my shoes and run on my treadmill. Everyday I pushed myself through the fatigue and cooked rather than picked up food for takeout. Everyday I resisted the urges to eat the bagels and donuts people brought in.
You just have to push yourself to do it- I realized that waiting around for motivation was just a waste of my time BUT when I saw the numbers going down and the numbers from the doctor looking better that motivated me to continue
Pick a plan (that IS doable) and stick with it. If gradual changes work better than go for it- if cold turkey works better for you than do it.
Good luck!