Both of these things are easily done. Living the life accordingly is what is hard. True signs are loving your fellow man and being concerned about his welfare. Angels are very loving and kind. They posses a warmth and a great aura of humility.
Angels possess no self-centeredness.
They have no ego's or sense of 'greatness'. Keep in mind, they are in human form and not perfect beings in this state of existence but have pure Spirits. They believe and will confess the issues I stated, and very emphatically as well. Now let me cover Demons while we are at it. Demons are Angels that have gone bad.