I've lost just under 40 pounds in the last 6 months on my own; surgery for me isn't until April 13. I had lots of bad habits that I needed to break, like soda, diet soda, chocolate, candy in general, chips, white rice, eating out too much, etc. I picked one or two things each month and weaned off of them.
The first month, I gave up candy and chips. Next month I gave up sugared soda, limited diet soda to 2 per day, and stopped eating at fast food restaurants.
Do it a little bit at a time. Making small goals will start the ball rolling for you, and that will motivate you to change the next bad habit. For me it was also motivating to have to weigh in every month. My insurance stipulates that once I started the journey and had my first weigh-in, that I couldn't go up so much as an ounce (from that first weigh-in) during my four months or I would be denied. No lie, that was a huge motivator.
Also, remember why you want this surgical tool to help you control impulse-eating and binge-eating. Find what works for you and what motivates you, and start tracking your food and water intake. Come out on the forums when and if you have a hard day and talk to us. We're all here to help and support you.
You can do this!