What does the process of selling off 200,000 of 1 coin look like?

Is it as easy as typing in 200K and hitting sell?

Could you exchange all the coins you have to a stablecoin like USDC easily so you can sell safely over time without losing value?

I know some will ask themselves why this is even a relevant question because they doubt anyone will come into this scenario.

ONE, I’m curious and I’ve heard of obstacles you could run into trying to do this. And TWO, I’m thinking of acquiring about 200K of a coin and it’s important for me to understand how I’d successfully sell and profit from it if the coin rose in price.

So if any of you have any idea how this would be done smoothly—or even better if you’ve done this before yourself—your input would be appreciated.