I'll be in Ireland for 2 weeks in June. I'm hoping for good weather, but I'm sure we'll have at least a bit of rain while we're there. That's probably going to be the big test. And I've read that you can use the same air-gun technique for almost any grip out there, good news if you've invested in a compressor.
I learned Aimpoint Express by buying the video on their site, buying a level and then practicing the technique. That worked for me. I may still take a clinic somewhere down the line. I'd have to travel a bit to take a clinic.
The nice thing about the video is I can watch time and time again.
I signed up for an clinic on June 4 at nearby St. Clair Country Club.
Instructor is Rob Strano, whom I met at Orlando. He grew up locally, and is lead instructor at a Strano Golf Academy in Florida.
According to the AimPoint web site, St. Louis has no resident AP instructors. Nearest ones are Kansas City and Chicago.