I agree, pretty easy. My best girl friend is a massage therapist. Years ago when she was going to school to learn massage therapy, she lived with me. So she would come home from all day at class (year-long program) and needed someone to practice techniques on. So I got lots of good massages. I paid attention to what she was doing, how she was using her hands and picked up on lots of good practices.
So in addition to watching videos online, I would recommend getting a couple legitimate massages from experts and really pay attention to what they do and how they do it. You'll get enough good ideas to make other guys melt in your hands.