Correct ! It is serious matter. Many famous Tibetan Masters confirm that it is a "must" to dp "Kuan Ding" and "Qian Xing"....This is for your own empowerment, protection, guidance, purification, and link up with the "Lineage of Masters"....advance practices always take their "Masters" very seriously.......
IF you are not purified, empowered, and protected......don't cry if things go wrong.....it is like doing surgery on your own without guiddance from Licensed medical doctors in a well equipped hospital .....
You better check with reliable Tibetan Masters first, sometimes, what you think you know is what you "don't know".....
This is not playing toys !!!