I am also the impatient type but, plunging in the deep end when learning an instrument does not work. Not for anyone. However, if you take it one step at a time and are disciplined about regular, daily practice, you can progress very fast.
So, take it step by step every day, and before you know it, you'll be in the more advanced lessons.
I've been taking lessons here for the last two weeks every day, and I'm almost through level 1 beginners. But I won't rush through this even, because I want to make sure I can change all the chords in the beginners series with ease and in time. This is crucial to playing songs at the right speed.
Anyway, you are now on track! :) Don't lay down your guitar until you are through all the lessons and you can enjoy the fruit of your labours.
The accidental guitarist.