I am pre-op... surgery is Nov. 2nd..and I know what you're talking about. I too have used the past 3 months to prepare for this permanant lifestyle change. What I found that worked for me is...I made my plate..or ordered as normal. Then I would only eat half...take home the other half or freeze it. Sharing with another person helps too! This helps you cut back on large protion sizes.
I am on the liquid part of the pre-op...and it is easy because I was already use to the small portions.
I drink 80-100 oz of water a day...so I never really feel hungry! Eating slow is still a hurdle for me. I have 4 girls living at home and 4 other grown children outside of the home..we are never still. So...that will be my greatest challenge!
I hope this helps!