My first foray in to the world of HDD was 10 years ago, shortly after I began my current job as an instructor. We had instructors who taught HDD already, but our coordinator decided that it would be a good idea for me to shadow their class in case we needed to run an HDD class and they were not available. “Drilling is drilling, right?” he said.
So, I worked with our HDD instructors for a couple of classes and learned the process in case one of them got sick. I even got proficient with two different types of locaters but, at the end of the second class, went back to developing the vertical drilling curriculum.