Hi Paul. Welcome aboard. Your fears and questions are mostly normal for someone who is just starting to look into banding as a possible option. The very best thing you can do is read everything you can find about it, filter out the obvious things that don't apply to you, and then get down to the basics of what banding will and won't do for you. Then you can decide for yourself if this is something you want to do.
The band is not a magic bullet. If you're lazy, want to do nothing to assist in your weight loss, and expect it to carry you along, you WILL be disappointed. Like any good tool, you need to learn how to manage it. The more knowledge and experience you have, the better prepared you will be to get the most from it, and the best possible results. So expect to have to get out of your chair and exercise a bit, plan that you'll have to learn how to eat proper, nutritious food, and know that your weight loss is your responsibility. You'll get out of it what you put into it.
As for your other fears, consider that there are THOUSANDS of people who have band surgery every year. Of those, a relative handful have problems, and that group is the people who post on forums like this one. The vast majority of bandsters have no issues, and are out living their lives without complaint. Take the complaints you read of with a huge grain of salt, because some people just like to complain, or they freak out because they haven't done any research, and they think since they had surgery three days ago they should have lost fifty pounds by now. (I'm being facetious, but you get the point - keep it in perspective.)
The liquid Protein diet is no big deal. As part of my daily diet I drink Protein shakes that taste like chocolate milk. But I eat regular food in moderate amounts the rest of the time. Yes, during my surgery they inserted a catheter. They took it out within an hour or so after I was out of recovery. I was unconscious when they put it in, it didn't hurt being in, it stung when they pulled it out, but the pain immediately went away. After I could pee normally they let me go home from the hospital. Some guys have issues with that because of the anaesthetic used in surgery turns off the bladder muscles for awhile. But within a day or two I was back to normal. It was collectively no big deal.
There are adjustments required for every new bandster, as they get used to having the band placed, as they heal from surgery, and they learn how to live with the band. It takes work to stay focused on the steps required, but let me tell you - the results are SO completely worth it! If I ever have to give up my band it's going to have to be cut out of my cold, dead body. I'm never going back to what I used to be.
I started this journey at 320 pounds. Now, just under eight months later, I weigh 212. That's 108 pounds gone for good! I started this wearing size 3X and 4X shirts. Now, XL shirts are getting to be a bit big. I started this wearing 44-46 inch waist pants. I'm currently wearing 34 inch waist pants. When was the last time you wore an XL shirt or 34 waist pants? I'll bet it's been awhile, right?
So relax, stop worrying about things that are non-issues, and study up on whether banding is the right choice for you. If you decide to move forward, there are plenty of people here who have already walked down the road ahead of you, who are willing to lend you a helping hand.