:lol: :lol: :lol: OMG I love your narrative of what it's like to FMQ.
Aching arms, overheated - ya, that about sums it up.
I think you did a good job. Individual stitches disappear into the big picture, and overall the quilt will hold together just fine. I've never tried following squiggly lines but just make my own as I go.
Most often I use FMQ to fill in sections of my quilt rather than trying to quilt the entire thing in one go.