Always go to a hairdresser! Home highlighting kits are evil! Seriously, unless you have a friend who is a hairdresser, don't even consider doing it at home.
You could always try a college/trainee hairdresser if you want to do it on a budget as a first try. Upkeep can be expensive, having your roots done around every six weeks, depending on how quick your hair grows and how dark you are to start with.