Discharging High Voltage on RCA CTC-5

[TVBeeGee]

Any advice on how to SAFELY discharge the ultor on a RCA CTC-5 with the metal 21AXP22 CRT? I have not done this type before. Looks like the connection to the tube is buried behind the insulator surrounding the entire tube and the other end of the lead connects directly to a chassis connector at the high voltage cage. Unplugging the charged cable from the chassis seems like a really bad idea (shocking!), so can this be done by a method that avoids electrocution?