If the CRT has been unplugged for a week or more, the capacitor should have lost its charge. But I always check anyway just to be safe. I had a TV the other day where I could not find a ground on it. I don't know if this is true, but supposedly you can use the aquadag as a ground. I did not make that word up.
Most likely the beam should be grounded; you can use a continuity tester from building ground to the beam to check. If you use the beam, make sure you are connected to the steel by scratching off a bit of the rust-inhibitor coating.
The copper water pipe would be a better ground though. That's the way I would go if it was close enough to the work place.
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