I also went alone to Dr. Aceves and I was just fine. A friend was going to go with me but at the last minute was unable to due to work obligations. Once I got there I was glad she hadn't come because I wouldn't have wanted to worry about her (was she bored? was she having fun? was she comfortable at night? was she warm? was she cold? did she have enough to do to keep busy? was she getting enough to eat/drink? etc.) and I was able to focus on myself and doing what I needed to do to heal and be comfortable.
You will get to know your fellow sleevers during the pre-op stuff you have to do and once you all go to the hotel you may find yourself dining with them like I did. You will check in on them and they will check in on you - so you will have that support. Plus, I found that I got extra visits from both Aceves and Campos since I was alone.
If I needed anything (lights on/off, door open/closed, etc.) the nurse was there within seconds.
You'll do great!