I usually respond to such questions with my best answer figuring that there are many who could use the info even when the nature of the question screams that the best advice would be to stay away.
Anyone not knowing which side is high or low, should not be working on airconditioning. Since its obvious that such advice will go unheeded, I guess an old anarchist like myself can see good reason for legislation to keep fools from hurting ones self. Unfortunately that was not the reason for legislation on handlers of R12, because they made these toy kits and an even more dangerous (but evironmentally safer) refrigerants with no rules.
Bosch Master, ASE Master, L1
33 years MB technician