I've seen this reposted many times, many places, and I always wonder ... maybe this person was just not very good at soldering. I had professors order me to do things they didn't know how to do themselves many times. Working with zero competency and support is the norm in academia. Soldering is a bit of an art. I'm a natural, soldering, brazing, and welding are really, really easy for me, but some people never get it and never improve. I did a four-month welding course and there were some people who were no better at the end than they were at the beginning.