I learned a lot from taking a Charisma Arst workshop last month that really improved my conversational skills via the Juggler Method.
There are so many workshops out there teaching different methods. The workshop could give you an edge and push in your improvement,but for the most part you'll still have to rely on your observing ego to help correct mistakes made in the field.
I studied and watched a few of David D's dvd series, and sarged clubs/bars for nearly 3 months, as well as the DJ bootcamp here just before taking the workshop. The instructors thought I was already pretty calibrated, so my work was really in fixing body language/tonality.
You'll find that everyone's different and all have different and yet similiar styles. The instructors are very observant and will help you fix a few things.
I think in your approach journal you said you were 34, so I can see the workshop rekindling some old fire, if you need help in approaching and giving your personality a tune-up.
Experience is the ultimate teacher, if you can learn to calibrate and fix your own errors in self-reflection after a night out sarging, then you'll go far. Just experiment with different approach techniques and you'll be fine.
As long as your committed and you don't give up, then you'll improve naturally.