Started liquid diet today

 I sort of did the same thing.  About 2 weeks before the LD began, I started eliminating lunch and replacing it with a protein drink.  About 1 week before, I replaced both breakfast and lunch.  I did think it made it easier when I had to go to full liquids.

The first few days are horrible but it gets better on about day 4.  I started exchanging one meal a few days before my two weeks started to help soften the blow.  LOL

I did that, too (also as part of testing out various protein powders).  Unfortunately, it didn't help as much as I'd hoped!  The first day was the worst as far as hunger goes.  Since then it hasn't been too horrible - it's more keeping a rein on head hunger issues (why is there food EVERYWHERE???). 

Good luck with your surgery!