In my early young career, I had not the chance to do unit tests and back then it was not a trending skill. After a return in school, Ill have a class this semester that covers unit tests and I can't wait to learn more about it. I too find it overwhelming, hopefully that course will help me.
During my last internship in a big corp, they had many IT solution and despite their gigantic size, their wasn't a single unit test. While waiting to learn about unit tests, I am reading "Building Maintainable Software" published at O'Reilly. There is a lot of useful tips on how to make consistant and short unit of codes so you can better test them and maintain them. I highly recommend this reading.
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