I think most home users skip a few steps.
The question is whether those skipped steps are crucial.

This video shows how to use (what they call) a plugpatch
in which they use the following tools and materials:

Tools:
A. Half-moon scraper
B. Carbide cutter == appears critical to use!
C. Tungsten conical rasp
D. Stitch roller

Materials:
a. liquid buffer
b. super valkarn g vulcanizing cement
c. sealiner
d. PW-3505 Plug Patch

https://www.youtube.com/watch?v=-78JIOaEG6c
1. Remove offending object from the tire & inspect inside
2. Mark outside crossshatch and inside circle
3. Spray liquid buffer & scape with half-moon scraper
4. Carbide cutter to 500 RPM (very slow speed!)
5. Conical Tungsten rasp at 500RPM on inside circle
6. Vacuum or brush away buffing dust
7. Vulcanizing cement applied and dried to the tire & hole
8. Vulcanizing cement applied and dried to the plugpatch taper
9. Insert and pull wire until the patch dimples
10. Stich with a roller from the inside out of the patch
11. Restore overbuffed area with seal liner
12. Cut off the plug from the outside

Most homeowners seem to skip a *lot* of steps!
https://www.youtube.com/watch?v=-R8IZ_mPh_U