We have successfully cut the sugar in our home. My family has a history of diabetes, as does my husbands, although neither of us have it. My son is mixed, part American (with some native american) and part Japanese. Native Americans and mixed races have a higher chance to become diabetic, so I really wanted to teach my son about good nutrition from a young age. Now, my husband and I both had a huge sweet tooth, and my husband liked the fatty junk food as well. It took a lot of effort, but we have cut most of it out of our diets.
Start with looking at labels. Sugar is hidden in many things. Salad dressing is a particularly bad one. I make my own dressings now. I would cut one item a week, until you are down to just one item which could be your special treat from time to time. If you bake your own sweets, try decreasing the sugar slightly each time you bake it. I have managed to cut most of my recipes sugar amount in half, some even less than half.
When my son first started eating, I made a discovery. I actually liked plain carrots, plain cucumber sticks, plain broccoli. If you eat plain food for a week, then go back to slowly adding the sauces, you may find you don't want as much of the sauce.
If you make your own sauces, you can cut the sugar, bad fats, and salt out a lot. If you learn to make big batches, you can freeze some of it for later. Learn to use herbs and spices to add flavor to your food. They are so much healthier and in my opinion they tast better too.
We only drink a small glass of juice a day (100ml). We have one glass of milk a day (200ml). Other than that it is water. If it isn't in the fridge, you can't drink it.
My son eats snack food and sweets sometimes as a special treat, but he is fine with eating fruit, chestnuts, raisins, yogurt, cheese, or vegetables for his daily snack.
Start slowly and form new habits. As you adjust, cut a little more until you reach your goal. Try not to focus so much on the end goal, but on how much better your body feels as you slowly cut out the sugar. Too much sugar, actually can make you sluggish. Try adding moree nutritious things to your diet slowly. Make sure you have plenty of complex carbs, protein and fiber in your meals to help curb the desire to grab something sweet when you feel hungry.
Good luck. It is so worth the effort it takes to become healthier.