*waves* Hey Dani!!
I definitely agree with taking it in small sections. I started about where you are and if I stopped to actually think about the number that I have to lose, I'd be so overwhelmed I'd probably not be able to even think about putting one foot in front of the other.
So, I decided that I didn't have to lose 100+ pounds. I only had to loose 5 pounds. That was it. Just 5 tiny little pounds. When I reached that goal, I set another for the next 5 pounds and so on. Every 5 pounds was cause for celebration - even this far into my weight loss journey I don't look at the whole picture. I just eye the next 5 - 10 pounds.
It won't take too many of those goals to start seeing other goals being met as well. Those jeans in the back of your closet that haven't fit for a few years? They'll start fitting. The jeans you've been wearing because they're so comfy? They'll start falling off of you.
For me the weight loss/life style change isn't about maintaining positive motivation - it's about being committed to the process. Sometimes I'm so UNmotivated that I will throw an inner temper tantrum because I want something that I know I *shouldn't* have - but I've committed to being healthier and making some positive changes in my life. So I let my inner three year old scream and yell in my head (incidentally, it's the same voice that screams and yells every morning when I have to haul my tired self out of my warm, cozy bed and go to work) and then I get on with doing what I have to do.
Also, I've learned another important part of the process for me was to recognize that it IS a process. Sometimes I'm going to make bad choices, sometimes I'm going to slip up and sometimes I'm just flat out going to decide that something is "worth" the extra carbs, fat, calories, etc. and that's okay. The important thing is to not let that slip become a defining moment in my journey. A slip doesn't mean I've "ruined my diet" and therefore give me leave to continue eating anything and everything I want. A slip is just a temporary deviation from my new normal.
You can do this!!!