Well, I needed some assistance from one of my friends who -is- fairly familiar with Linux to get Lutris installed and going, and then he helped me with a command to copy all the huge .dat files from my PlayOnLinux attempt into the new Lutris attempt so I didn't have to spend 10 hours redownloading all of them...
And it works! It totally works! Logged in fine, loaded up character fine, entered into the game properly fine, it's all good! Lutris was the answer!
And it works! It totally works! Logged in fine, loaded up character fine, entered into the game properly fine, it's all good! Lutris was the answer!