Re: not to be put on and off
This whole thing reads like someting from a primer on manners from the late 1800s. Is this really something that you need to fret and worry over?
Here's a modern version:
You shouldn't think about good manners the way you do your finest clothes: something to be used only on formal occassoins. You should be polite all the time, and if you do reserve good manner only for special times, you might find it feels awkward to use them. Even if you consider yourself well-bred, if you aren't polite at home, you probably won't be polite when out and about.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.