As you get to know your limits everything is in small amounts. In terms of sips I sip (swallow) about two at a time, then wait a minute or two, and sip again. Liquid seems to go down (on me) with no difficulty. it takes me about 10 minutes to get through a Boost high protein energy drink (liquid). I am sure I can get through it quicker, but do not want to push it just yet. In terms of feeling full - today is my day 4 after being banded and I haven't felt hungry yet - thirsty yes, but no hunger for food (desire a bit) - my daughter the same - we are taking in the liquids because we know we need to, but based on what I've read the "hungry" will come soon.
As you prepare for your surgery, based on your doctor's recommendations of course, have what you need in your house a ahead of time, chewable vitamins, high protein drinks that you like, broth, sugar free jello and popsicles... These are things you will need to select because others despite their best intentions will not always make smart choices for you (this is experience speaking).
Also, make sure for your first day or two some is there to help you get up and lay down - you may not need it, but that was something I didn't realize I would need and I did (luckily my husband was there).
Finally, depending on your size, flexibility, and soreness level have a plan as to how you will clean yourself after using the bathroom (another thing I didn't think about ahead of time). Needless to say its a temporary thing, that may not apply to you, but its important.
Hope this is helpful.