I was lucky - I worked my way through accounting school by being a bookkeeper with a lot of good mentors. I had a ton of various real world experience when I got my degree. It took me 7 years to get a four year degree since I was working full-time too. It made a huge positive difference in the long run.

Yes, definitely stick to one until you know it. Taxes will never let you down since everyone has to pay them. Suck in all the knowledge you can :)