What's a Christian To Do with Tattoos? Or Beard-trimmers? Or Polyester?

Jesus said that He didn't come to abolish the Law of Moses (Matt. 5:17), yet most Christians don't think it's sinful to get tattoos, or to plant a field with multiple kinds of vegetables, or to eat pork—things prohibited in the Law. Why do we consider those commands abrogated in spite of what Jesus said? If your answer includes categories such as "civil, ceremonial, moral law," you are reading theology rather than studying the Bible. You won't find those divisions in the Scripture. So what do we do with the Law of Moses? In today's study, we begin a series discussing that question.  

The sabbath series I mentioned can be viewed here: https://www.youtube.com/playlist?list=PL5Yobt1jZDd94ilNelBW6jdEGhkgZBScM