The guidelines keep changing too. Breaths to compressions.
One of my instructors told me, "You are working on a dead person, you can't make it worse." This is true but it doesn't reduce the stress.
Your friend owes you a beer. My son gave me a grandchild!
Good for you! My two grandsons are in Germany as of two weeks ago with my daughter and SIL for a 3 year hitch. Not happy about that but that is the Army. FReegars Eaker, and Happy New Year!