I don't think working with a solo is the best way to prepare. The solos I've worked for have been good guys, but they really sucked at managing a firm.
An internship at a small or medium firm would be good, especially if you shadowed the paralegals as much as you could. Figure out the nuts and bolts, the state and local rules, and then the law will come. I had to do a probate case in another state, and nobody at my firm has ever done probate. The substantive law was easy to learn, but the procedural crap wasted all kinds of time.