I'd recommend taking up Randy Harris (Cruel Hand Luke) on his offer to go take a class from him. You never hear bad comments about his training but always hear positive remarks. Money well spent.
Beyond that, there is a lot you can do on your own to improve your shooting accuracy. I am going to go out on a limb here and say that based on my own 20+ years experience shooting firearms, accuracy is 10% physical ability, 10% technique and 80% mental. All of these areas improve with time and use. You cannot expect to go out to a range and be Deadeye Dick with your first 10 rounds. The hardest area for most people to improve in is the mental aspect, but that's why improvement comes with use and exposure.
Once someone has shown you the proper techniques -- or you learn them yourself -- your physical abilities will improve quickly as you learn to use new muscles in new ways, and your confidence will begin to improve dramatically as you start seeing improvements.