Everyone probably has different answers to this. I'm only 12 days post-op, so I can't really speak about living with the band. But for the actual surgery, the hardest part for me was the pressure in the center of my chest for a few days. In fact, I had to sleep the first night sitting up, it hurt so badly -- and that was only for five or six hours. After that, I was able to go back to bed.
Then there's the time affectionately referred to as "Bandster Hell". Now that the swelling has gone down where the doc placed the band, I occasionally get hungry enough to eat the way I did before surgery, but what I can actually have is very limited (still on full liquids until Thursday). It's pretty frustrating to have gone through all I did to get to this point, and still be able to eat like I did before. But even that's not too bad yet, unless I let myself get too hungry or don't get my Protein in.
It's also been difficult to remember that there's no drinking with meals, or for 45 minutes afterward. Some days -- some meals -- are better than others, but I forget at least once a day. As soon as I remember, I remove my drink and follow the rules. I assume this will get easier as I develop a new habit.
Someone with more experience may have other things to talk about, buy that's where I'm at. If you have any other questions, feel free to ask!