One of the most important things to keep in mind, especially if you're just starting, is that its okay to just build a test puppet first. I always do. Its just an exercise in getting to know the pattern and how to put it together. When a seamstress is doing a new, unfamiliar pattern she'll typically try it out using muslin or something similar so she gets to know how its supposed to go together before she starts cutting up the "good" fabric.
So, before you get all involved in trying to hit a home-run on your first time at the plate, take a few warm-up swings first. You'll be glad you did.
-Gordon