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Wire guage varies widely based on set and application. I've seen high tube count TVs where the main heater line is as thick as the stuff in the walls of your house and I've seen signal/B+ hookup wire as thin as the stuff in phono arms...look at what is there and don't go thinner.
IIRC seleniums + end is the same as the band in the diode, and is the end that hooks to the B+ rail.
I usually kill 1+ irons per year so I buy the 6$ new/used non-adjustable specials...Not the ~$100 buck stations.
Best way to discharge is with a HV meter. The slow bleed of the resistor prevents dielectric bounceback...Don't matter how the set is powered.
Some sets have safety bleeder resistors from line to chassis and other dumb stuff...Analyze the schematic case by case and revise as needed.
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