With the trial accounts, you can get to level 20 for free. I suggest getting at least that far before committing yourself (I wish I'd known that).

Once you get to twenty, if you're still not sure, consider going the time card route.

I've wanted to try multi-boxing for some time. I recently had a small windfall and decided to use that to fund the purchase of four extra accounts, four 60 day time cards, and two copies of keyclone. As I hadn't expected the money, I didn't feel like they had cost me anything.

Once the 60 day time cards expire, I'll assess where I've got too and whether I want to continue. If I do, I'll buy another four time cards and re-assess again after another 60 days.