to safely discharge a CRT you need to make special well made probes. It means you have an understanding of soldering, gluing plastics and choosing dielectrics.
I suggest you buy one.
https://www.amazon.com/Huhudde-Voltage-Capacitor-Discharge-Electronic/dp/B07W7JT7WCYou might want to find one from a better brand. And when you use it every time you need to do a detailed inspection of the wiring for faults.
I suggest for HV work you keep a special set of probes (that you only use for HV), of brand name, and a discharge tool. And that you keep them in a bag (not a box with a hinge that can smash insulation) and take care of them with deoxit and cable cleaning wipes. Kind of expensive but its a really easy way to get your self killed in liue of spending say $60 for a HV kit.
I mean this under 1000V. Over that you need some even more specialized stuff.
https://www.zoro.com/fluke-disposable-paper-wipes-6-sheetspack-mc6/i/G1448806/feature-product?utm_source=google&utm_medium=surfaces&utm_campaign=shopping%20feed&utm_content=free%20google%20shopping%20clicks&gclid=CjwKCAiA9bmABhBbEiwASb35Vzv9WWGkiFVp7zb2d2h6TLSgBu2vw1rFYU-Rz_lxQds3RyVbnBglXRoCPEgQAvD_BwEhttps://www.amazon.com/Hosa-D5S-6-DeoxIT-Contact-Cleaner/dp/B00006LVEUThis should ensure you get a good measurement, and your meter takes minimum damage from insertion. One thing I noticed that could get you killed with a fluke scopemeter is that the banana jack solder joint broke, so it was floating from the PCB. It could tell you there is a low voltage vs a high voltage. You want to limit insertion force to keep them in good order on your HV measuring equipment. Of course I recommend having a 9V battery or something to test the probes and meter with before measuring the capacitor connected to some kind of screw, crimp, etc (that will 'verify' that your probe tip is not too oxidized or whatever). Don't let the 'nice parts' of HV like oxide breakthrough lul you into a false sense of security by using dirty equipment with shoddy connections. Some people might even say you should keep 2 identical meters around to verify each other for intermittent faults related to interconnects.
Yay, you got a reason to collect multi meters now, you no longer have a hording problem.
Basically you need to do every stupid fucking simple thing people never do with 5V circuits powered from batteries on HV capacitors.
Can I ask what happened exactly that you got shocked? did you get fooled by a dirty connection or something insidious like that? BTW, also, when you verify the equipment is denergized, and its crusty, make sure to clean or replace the connection near the capacitor if its dirty, i.e. resolder joint, redo crimps on wire, even if you are not sure the equipment will work in the future, in order to give yourself a good probe point on the capacitor and not have to deal with a difficult connection more then once. Like if you made a connection on some really badly oxidized barrel crimp that is bearly accessible from the insulation, just cut it off and put a new one on (once you know how to make good crimp connectors), so its easy to probe the 2nd time. That drain resistor can break... at any time.. so you are never safe, just confident, minimize the number of times you need to probe nasty circuit points to 1. Only 50 cents in crimps and takes 2 minutes.