I have looked into taking the class, this is what I know.
1. They will sell you the mortar for a single repair project without you taking the class, you just have to talk to the right district manager.
1a. Jahn mortar is one of two repair mortars recognized by the Indiana Limestone Institute as appropriate substances to apply to natural Indiana Limestone.
2. I only know of taking the class in Baltimore, but as the saying goes, you don't know what you don't know...
3. I have not taken the class, but after completing step 1 I have been able to complete a few repairs.
4. Their repair mortars are pretty good, and you have to follow the instructions closely, but I have had decent luck with it.
5. I spoke with one of my suppliers from Chicago who attended the class just for a better understanding of the product and in his advice to me was to spend my money on new tools, the class was pretty basic.
6. Jahn keeps a list of contractors and mason who have taken the class and I found it on line somewhere. You might be able to find another contractor who alligns with your business style and will subcontract the repair portion of a project. Based on the number of names on the list, the class must be evaluated on attendance...:whistling