I have not read the post that you referenced, but I 100% disagree with anyone who thinks that you should not disclose your history before admission. Law Schools only want people that will be ale to take and pass the Bar, and most Bar Associations will not allow you to test if you have committed certain crimes; namely those associated with fraud or theft. Whatever your misdemeanor was, I would disclose it and contact the school to talk or meet with someone in order to discuss the issue. Your honesty might make the difference when they are sitting around a table looking at potential candidates.
I witnessed several students who were kicked out for crimes they committed during law school, let alone crimes committed prior to admission. My point here is that being admitted does not shield you from your actions.
I realize my post sounds a little harsh, but there is still hope. Many of the misdemeanors out there won't hurt you too much. I knew law students who had convictions for DUI's, Illegal transportation of alcohol, and (minor) assaults... the Bar and your school know realize that people make mistakes That is exactly why I think you should talk to your school, they will know best whether your conviction will hurt you or not, and could save you a lot of trouble and worry.