I'm with you on this one, leatherman!
Get the license, the kit, and a few cans and you're all set. Nice thing about staying with R-12 over a blend is you can top off each year, which you can NOT do with a blend. The only advantage to blends is slightly better performance (over R-12) and lower cost (but not by much!) I am sorely tempted to convert my R-134a conversion over to DuraCool, after reading rebootit's vent temp drops (wow).
Regards,