Here's a somewhat more contentious point: one method I would recommend avoiding, or using with caution, is this -

You see an experienced floor singer perform a song you like. You've heard them do this song a couple of times - it's one that they do really well and everyone enjoys the performance. You go up to them afterwards and ask them for the words. They agree, and send you the words in an e-mail. So far, so good, but then ...

You get up at the same venue the following week and perform that same song, in the same version, slightly out of tune, and with less authority and confidence than the singer who provided the words, who is sitting there looking a little bemused.

By all means ask people for the words of their best songs, but don't come stomping in to their regular venue the next week and sing it in front of them. Even if the singer isn't much good and you think you can do it better, it's still a thoughtless thing to do. It is just a matter of etiquette and good manners, and one that might be worth mentioning to new singers starting out.

Marje