Here's mine:
Try not to get too complacent with the fact that initially, the sleeve really does do the work for you, through pure and simple restriction. You couldn't not lose weight if you wanted to. Even when you get to solids, you're still so tight and restricted that you can have a little treat here and there and not have it affect your weight loss, so it's way too easy to not work hard enough on your eating habits.
But here's what can happen: You get a few months out, and not only does your weight loss slow down naturally as you get closer to goal, but pretty much all the swelling's gone down inside, and you can eat a lot more. Suddenly the freedom to eat like you're in maintenance instead of the losing phase isn't there, and trust me, it is SO HARD to get both the body and especially the mind back where it should be to get the pounds off.
So, my advice is that no matter how great the weight loss is going, no matter how easily the pounds fall off initially eating "normally," remember that it WILL NOT LAST that way and stay on track until you hit goal... don't count on the sleeve to do the work for you, just know that it enables you to actually DO the work yourself for the first time ever, and that you WILL have to do it yourself.