Roog, like you I got myself a s/h Cisco 2960 about a month ago.
I found a manual at Cisco's homepage, Express Setup. Here you can find an easy description on how to 1) Reset the unit to factory standard, and 2) Do a simple set up after resetting.
I followed the instructions and I was up and running in a very short time. Well, I could have been, because I had no connection through the switch after putting it between the router and the NAS and streamer. It turned out that I only needed to power off router, switch, NAS and streamer, and gradually turn everything on again, in said order, waiting a few minutes from one to the next.
In the manual is also described how to log in to the switch in a browser window to see info on the ports and apply some settings if you should wish. I haven't changed anything, I think, except for maybe setting up a password during the first setup.
Maybe I have just been lucky and it's not always as simple as this. But I can recommend the Express Setup guide, was easy to find via Google.