Start small! I found this simple pattern that someone was using for their Bible study group. Besides using different aspects of the sweater for their study they also explained that if you could master this teddy bear sweater, you were on your way to making any size sweater. I like that. If all goes well I'll post a link.
I have made sweaters in the past, I just tend to avoid complicated patterns. One day, when there are no distractions, I will knit something wonderfully difficult!