I'd say you're gonna hafta find that big socket.
I tried bumping the engine over to locate my torque coverter drain plug. Best I could do was just seeing the edge of the plug. You've only got a couple minutes of angle to hit the access window.
Once I rolled the crank by hand, I was able to center the plug without problem.
If there is a crossover pipe blocking you from using a hex drive socket, think about using an appropriate sized allen key, 5mm I think.
You definitely want to drain the converter, as that is where a large portion of the fluid resides.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.