What safety precautions are needed when working on an iMac G3 with a CRT? I have an iMac G3 that I'm planning on playing around with but need advice on handling the CRT and how to make sure I don't kill myself.

I have read quite a lot about discharging the CRT and the one thing I'm not sure about is how to make sure that when discharging you have the tool properly grounded.

Do you keep the computer plugged into the mains, but with it off, so the earth connection is still attached and thus used when discharging.

Where is the ground lug, which seems to be referenced in a few resources, such as this one, as I want to ensure I'm connected to the correct bit, so I don't become the ground.

Will wearing electricians gloves (or gloves suitable for handling high voltage) help protect me when doing this, or will they end up being cumbersome and give a false sense of protection?

Is it a good or bad idea to wear rubber soled shoes, will this also help insulate me, or again give a false sense of protection?

I guess the more precautions the better, but just trying to figure out what's actually helpful and what's not.
I can verify that the advise in that article is correct. I have discharged and serviced CRT Macs. 

I personally am not going to give you any safety advise as it is a potentially dangerous process and should not be undertaken if not confident. I would avoid servicing these machines especially if you do not have access to the official service manual.