Couple questions about Prime coolant change.

I heard about some lengthy process, but this seems fairly straight forward.
1)Open engine and inverter coolant filler caps.
2)Drop the under panels to get to 2 yellow drains on driver's side.
3)Drain both coolants.
4)Close drain valves.

(now this guy IIRC replaces the under panels THEN fills and runs to 'burp'. I'm gonna fill, run to burp, check for leaks, let it cool back down, THEN do the under panels)
5)Replace panels.
6)Run to burp system and refill as level of Inverter drops.
7)Replace filler caps.

This guy does some fancy thing to put it in "maintenance mode" but vid is older and not of a Prime. I think I'll just start with fairly low traction battery so it can be in CRG mode for a while.

Questions are: What is coolant capacity for both engine and inverter? How much do I need to buy?
In second video the guy says its important to eyeball that the coolant in inverter is showing motion, so its not cut off by some big air bubble. He also lets it start engine cooling fans twice as per specs.
Does the coolant ever want to boil up and out like with old cars? Video was shot out of sequence so do you replace caps with engine still running?

 

Thx! Where does one get that full manual?
Got the sheets for Spark Plug replacement and Brake Pad replacement?

 

THANKS!