Hi John Boy,
I found the manual. It looks like they expect you to degrease the action and then spray some oil on it. Is that what owners are doing?
Depends on the owner. I have nine different Lightnings and clones so am familiar with taking them apart. Others can't figure out how to get them apart or, more importantly, how to get them back together. They are not complicated, but are tricky to get back together the first few times you try it. Even after years of using them, sometimes getting the upper and lower receiver back together is a challenge as getting the parts to mate is partly knowledge and partly luck.
It you aren't good mechanically I would use brake cleaner and an air hose to blow it out and then some spray oil. If you are adept mechanically, here's the basic take down procedure. Remove the stock, remove the magazine tube, remove the two screws on the lower rear of each side of the receiver. Put the pump handle in about the half-pumped position. Start wiggling the upper and lower tangs until the upper and lower receivers start to separate and then wiggle down and forward until the half-moon tabs separate. (Make sure the elevator is DOWN when separating the upper and lower receiver.) Then pull the lower receiver clear. You can then pretty much clean everything with a toothbrush and some cleaner.
You got a good price on the Taurus, but be aware they have a poor reliability record. Even when clean, if you got one that works count yourself lucky.