I did not have to do any sort of liquid diet prior to surgery. Three months prior to surgery I had to add in one protein shake a day as a meal, 2 months prior I had to losely encorporate a second shake, and for the month prior to surgery I had to stick too the 2 shakes as meals. I was also told to start eliminating carbs as soon as I started the whole process. I can tell you I loosely followed the guidelines. I was banded 6 weeks ago and have not had a single problem sticking to the guidelines post surgery. I stuck to my 5 days of clear liquids, 2 weeks of protein shakes only, then 2 weeks of lowcarb mushy foods before being allowed to introduce solid foods. About a week into the protein shakes only I started to really miss chewing, but that was the only issue I had.
It may not be this easy for you but keep your head in the game and you shouldn't have any problems!