Going to Ferguson.com and ordering a replacement capacitor to have on hand for $30 works even better.

It’s literally just turning off the power to the compressor, using a screwdriver to open the panel, unplugging the old capacitor, and plugging a new one in.

Regardless .. discharge the cap, blown or not.

Clear the chamber, even if you removed the magazine and checked it yesterday.

etc.

The general principles of health and safety are intended to be largely overkill and mostly not strictly required, they're in place for that one time that kills or injures.

Please don’t give out dangerous advice, if you want to risk electrocution, that’s your choice. Don’t encourage others to perform work unsafely.

Maybe print the instructions and leave it with capacitor or watch a couple YouTube videos first.

The UX to make this consumer replaceable looks more like

1. Add a bleed resistor to the capacitor (its default state when unplugged should be discharged)

2. Use a modern consumer grade connector (ie sealed molex or deutsche)

If you really don't want to run the risk of being electrocuted, it might just be worth the 250 dollars to have someone who does this sort of thing all day to come and do the repair.