1. "Books closed" always makes me laugh. The best tattooists I have encountered don't advertise their books are closed, they will tattoo anything anytime (if they choose to). If the schedule is full, they will just tell you to wait or ignore you. My $0.02 "books closed" is my red flag.
2. No problemo. Some people like the consistency and stick to 1 trusted artist. But I think it's great to get tattooed by lots of different people, they all tattoo a little different and you get a variety of different experiences. I have 20 tattooists who have worked on me to date.
3. Not seeing the sketch until the day of is part the game. It gives the work that proper tattoo magic. Very rarely have I seen my tattoo sketches in advance. It's normal to be freaked out about this but after a few tattoos you come to love the anticipation and excitement. It's like Christmas morning. Most tattooists sketch out your tattoo the night before or the morning of. Keeps the tattoo idea fresh and focused.
4. Question marks mean you haven't thought enough. WHAT DO YOU WANT. You should be able to answer that question in as few words as possible. Keep it simple. And be open to the tattooist expanding on your idea.
5. If your nervous about 'outing' your tattoos a) don't get a tattoo, they are not for everyone b) pick a spot easier to hide. I had this same feeling and I got a bunch of body work before I dropped my tattoos down to the wrist. And before I had my sleeves, I made myself wear long sleeves to work for 3 solid years (winter and summer) to prove to myself that I could do it. You will eventually get to a point where you don't care, the tattoo is for you. I am at the point where if people have a problem with my tattoos - who I am - then I have no time or room from them in my life. The commitment, permanence and standing by your principles is something I have learned from getting tattoos over the years and really helped me find who I truly am and be comfortable in my own skin.
Good luck with your next one, sounds like a good choice for keeping some symmetry. Enjoy the ride !
Also, you are in Alberta - we have lots of excellent tattooists that are accessible (without closed books) scattered throughout Edmonton, Calgary, Red Deer and some of the small towns in between. There is a lot of tattoo history in Western Canada.