Rookie needs guidance for compression test

OK, just got a compression tester from Oreillys loaner program (free) for 2 days.
I watched some YouTube and read a couple posts here.
My main questions,
1: Do I have to remove the valve cover?
2:Do I have to remove the sparkplug tubes?
3: Do I have to disconnect the coil?
4: How tight does the compression hose need to be in the plug hole?

5:Now if I am able to do that part, what kind of compression # should I be looking for?

Now I also see Wet vs Dry. Since this is Slant 6, how is it possible to coat the entire head of the piston with oil? And once the oil is in there, will it just burn out when I reconnect the plugs? Is that safe?

thanks in advance
66 dart 225 slant 270 3.7