Your suggestion of discharging by unplugging power and holding the power button will cause no harm, and is likely to discharge stored voltages, so go for it. As for discharging yourself...
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Discharge Energy Storage Power
How to Discharge a Capacitor: A Step-By-Step Guide
While this energy storage is vital for their function – from smoothing power supplies to filtering signals and timing circuits – it also means that even after a device is powered down,
After power supply is turned off, voltage still exists and
It is a normal phenomenon. The reason it happens is because
Is it safe practice to "Power Drain" the PC before upgrading
Press and hold the power button for 20 seconds and then release it to drain the flea power (static electricity.) Reconnect all cables back again and turn on your computer.
How to Discharge a Capacitor (with Pictures)
They store excess electrical energy during power surges and discharge it during power lulls to provide the appliance with a constant, even supply of electricity.
How to Discharge a Capacitor: Comprehensive Guide
Capacitors store electrical energy and can retain a charge even when disconnected from a power source. Discharging is necessary to eliminate this stored energy
Battery Discharge During Storage | Schneider Electric USA
Any time a SmartUPS RT (1kva to 10kva) will be turned off without input power present, or allowed to operate in bypass for over 24 hours, the battery modules should be disconnected to prevent
How to discharge a computer power supply? (3 Best Methods)
There are three methods to safely discharge the capacitors of the PSU. Turn off all the power supply to the PC from the mains. Unplug all the cables and wires attached to the PC. Then hold the power
How To Discharge A Capacitor In The Safest Way
But the very same capacity to store energy makes it hazardous, especially when a capacitor retains its charge even after being cut off from a
Stored Electrical Energy
Stored energy is the residual or built-up energy held within a component. The easiest way to visualize stored energy is to associate it with cutting the water off in your house.