put them in a small jar, just a bit larger than the egg is, and fill it with water. put the cover on and shake the jar which will crack the egg's shell.
that should get the shell so it is just slides right off with no problems.
7 minutes or the eggs are ruined.
you better go on line and watch some videos and see.
No, do not boil eggs for 20 minutes!
the yokes will be over cooked and not be tastey.