I think an online reg service class would work great. The worst part about my HOG service class--this was three or four years ago--was that too many students were crammed into too small a space--a small dive shop classroom--and we all had to share the table and equipment. It was something like 10 students to one instructor. Oh, I had brought all my own tools because we were given a tool list for that purpose, but there was no space to put them, so I mostly shared tools provided by the shop with other students, which took a long time. For tuning, we all shared that same tank of gas, the same IP gauge, magnehelic, etc. If you own all your own tools and have a workbench, you're better off taking an online course than a course with a high student-to-instructor ratio in a small classroom.