Truing isn't really all that difficult if you read up a bit online. But that's also why it's pretty cheap to have a shop do it, so it's not like you'll go broke if you farm it out. If you like learning about the bike, truing is pretty straightforward, and you don't need anything more than a spoke wrench (a truing stand is nice but not required).

Either way, if you can see the wobble, it's time to have it done.