actualy if you are grounded you will die err. well a better chance of death that is. the voltage from the mains in the monitor is respect to ground so if you make a path to ground the current will use your body as a means to complete its path. as for the high voltage, if you only use one hand while youre in the monitor you should be safe, because that voltage is isolated by the power transformer, but even using one had as to not complete a path youl know it when it hits you, ive been shocked by the HV transistor a couple times and it aint fun i tell ya. but if you got a nice open workspace, and good lighting and arent utterly tired you should be fine, just dont get your witts up above you. as for adjusting the wrong potentiomenter, theres no worry there, you will just get an undesired effect on the screen, in wich case you just turn it back the way it was.