I have an old IBM 5154 monitor that works pretty well. It only has two issues: the screen is off-center and the color is too blue. I found a service manual for it that describes how to fix both of these problems: there is a H center adjustment and red/green/blue adjustments that can be made to fix the color/temperature.

I know how to discharge the high voltage, I have an isolation transformer, and I've even replaced all of the electrolytic capacitors in the power supply after two had blown up. But, it seems to me, the only way to make these final two adjustments is while the monitor is on...

So, other than using a fully isolating transformer, keeping one hand in my pocket, and not touching anything I don't have to touch, what else should I know or do before attempting this? In particular, I don't see a good way to separate the tube itself from the rest of the electronics, so I may have to reach around them to get the adjustments... thinking I may find a really long plastic screw driver to avoid getting my hands anywhere near the tube.