Thank you @acf-support Jimmy James! What I wish though, is if this information – “To get the user ID from the user custom field, you can pass a false value to the third parameter of the get_field()” could be public.
If I had known how to get the ID from the field, I would have figured it. I am grateful for the help.
To anyone else wondering, to get the User ID from the User Field,
$userID = get_field('field-name', false, false);
