You can get a good overview by attending GOAL's course The Art of Concealed Carry - taught by firearms attorney Darius Arbabi (Framingham, 508-395-6500) who is also an NRA-certified instructor/training counselor and GOAL director of education Jon Green (also NRA instructor/training counselor) . Offered about once a month at the GOAL headquarters in Northboro. One of the best I've ever attended. It's a four-hour course in the evening, and think it costs less than $100. You'll get to meet Arbabi in case you ever need his services. GOAL is the Gun Owner's Action League, 37 Pierce Street, Northboro, MA 508-393-5333 web page is
Gun Owners' Action League If you are a gun owner in Massachusetts - it's good idea to join GOAL, if for no other reason that to get their monthly tabloid - keeps you informed of laws, events, instructional course and lots of other information that is good to know.