For what it's worth . . .
Gigs like SF Opera are attainable, but you are probably going to need years worth of experience before they'll hire you as an ASM even . . .and you could wait a lifetime to call something there. While it's completely fine to have a dream job, think about the reality that you will have to pay your dues in the regional opera circuit for a while. During this time, my advice to you would be to base yourself out of a city that has a much lower cost of living than SF.
Also . . .I'm sure I'm going to get a lot of heat for this, but in my experience, remember to be business minded about your career. Part of what we do is art, and part of what we do is to be in business for ourselves. Do not move across the country unless you have a job waiting for you. In this day and age, it is very easy for an employer to hire you from wherever you are coming from, and THEY will pick up the tab for your relocation. If your dream is to become an AGMA stage manager, start the discussion about AGMA agreements, what companies should be paying for and what you should expect to pick up the tab for. I recently had a conversation with a young ASM working for an AGMA company who relocated and got an apartment before he signed his contract. If he knew what he was doing, we would have known that travel to that city, and housing during the duration of his contract would have to be payed by the employer, but he negated that by paying it out of his own pocket because he didn't know any better. The full value of any contract includes travel, housing, per diem . . . .don't sell yourself short by paying for things your new employer should pay for. They are counting on you to not be business minded, no matter how friendly they seem. The nature of the business of management is to pay you as little as possible and get the most productivity out of you. Hence, the importance of unions. That, however, is an entirely other post.