I'm surprised that no-one mentioned improving English skills.

I am constantly surprised at the number of CV/resumes I get that are almost unreadable.

If you start off as a pure technician it is unlikely that you will end your career using the same skill set. There will come a time when you need to write a report (or lots of reports) that require a lot of words to be put down on paper.

The problem you may encounter is to actually find a good enough course to take.