I say go for it. Think of how much you'll learn in the process. Every little tweak and adjustment you have to make as things set in and get used will be review for you. The initial setup of components, etc. often involves adjusting eavery part. This forces you to learn the ins and outs of a product. Building up your own bike is one of the best ways to learn the workings of every part of your bike. Even if it takes you a long time, it's worth it.
-Moab