Good Samaritan Rule?

There is nothing quite like thinking you are doing "a good thing" and being criticized for the "way" you are doing it. There's something inherently offensive about it. That's why so many states have passed so-called "good Samaritan" laws, which prevent lawsuits such as malpractice actions against doctors who stop and give aid to accident victims. Do the same rules apply to collecting and attempting to fix computer equipment? Today I posted some questions regarding an IBM S/23 I am trying to get working (VCF 5.0 is coming up fast). The 5322 unit I saved from a dumpster and found that the display was badly burned and feeble. A year and a half later I found someone who had a number of 5324 displays that he was going to pitch. I paid to have one of the displays shipped from St. Loius to L.A., so I could swap them. I suspected that this would work because the IBM part nos. for the internal display unit were identical. Today I swapped the displays, and it was mostly a success. But, I think I've offended some of you because I have, in effect, performed surgery with a sledgehammer. Yet, this is the best I can do. Although I'm an engineer, I'm an ME and my electronics background is mostly directed to digital stuff. (So I'm not a "doctor" which perhaps destroys the "Good Samaritan analogy.) I don't have anything close to an electronics lab (nor do I know anyone local that does) and, aside from an EPROM burner, my most sophisticated equipment is a voltage meter. Should I simply not even try to do anything, lest I risk criticism for doing it wrong?