Some friends and I who train in Hakko Ryu Jiu Jitsu plan on taking private lessons in BJJ to improve our grappling game. We were discussing it, and did not know the ettiqutte about bowing, what to call the instructors, etc. We are totally respectful of the art, and do not want to offend the instructors or other students who may be present. Any help on this would be most appreciated. Thanks in advance.