A social anxiety group therapy setting can be really useful for practicing social skills. For example, you might have a semi-scripted conversation with another person in the group, and then the rest of the group gives you both feedback. You'd either find you're better at conversation than you think you are - which helps with confidence - or you'd get useful practical tips.
What, and have to TALK in FRONT of a group of people. :)
I've not actually been diagnosed, and honestly not sure if I would be. The key for me will likely be just practice in areas that work well for me. It will make the work into habit and probably make me more comfortable.
Now to find the energy/courage to walk out that door to practice...