Can you imagine an angel just suddenly appearing before you and bringing a prophecy from the Lord to you? 

I can't imagine! I do know that Mary was “troubled” because about the third sentence in, the scripture says “she was troubled” and the Angel had to say, “Do not be afraid!”. I’m sure that would have been our first response too if we were in Mary’s place. 

God totally understood Mary’s situation. He knows that she needs encouragement and that she needed a safe haven. When He does ask us to do something that seems so difficult, He brings His way, His strength and His encouragement.