If you have been diagnosed with Type II Diabetes, you need to get your diet under control(exercise; cutting back on fatty food and fast foods; vegetables) and get your blood sugar in check. The problem isn't so much if whether not a surgeon will perform the procedure(those that are reputable will tell you need to get your sugar under control before even scheduling a surgery date; if you do find one that is willing, I would tread with serious caution), the problem is whether or not you face the risk of more complications versus someone who is non-diabetic, and the answer to that question is yes. Diabetes as a whole generally creates more complications than those who do not have diabetes.
Now if you had Type I(Insulin Dependent) Diabetes, this would make things a tad bit more complicated but even that wouldn't be impossible under the proper control and a good doctor. But since Type II usually can be controlled through proper eating habits, good nutrition and exercising daily, I would get to work right away if you have any plans to have LL any time soon.