So the Sarcelle is no longer kicking my ass. I ummed and ahhed about it for a couple of days until I accepted that I wouldn't be happy with the finished item as it stood - like with an extra yarn over or a missed one somewhere near the very end corner. So, I cut it off, called it a swatch and started over. And oddly enough, calling it a swatch worked because it didn't take me long to replace the work to where I was up to and to steam ahead.
You have to be wide awake for lace knitting. This meant that the row I just recently stuffed up due to not reading the instructions properly meant it was time to put it down, at 11.45pm. Trouble was, I was wide awake from lace knitting!