Do it, at least try it. It's great to get a 55gallon and start from there, but the money for lights/rocks/inverts/fish can quickly add up. Where as a 10gal, if things don't go well, or you don't like it as much, not that big of a deal. Read up on everything, start on the easy stuff and ask questions. If you're patient and work at it, you can have a nice little nano tank.
Just no Tangs....for now....