I'm sure you'll come right - don't be too hard on yourself - I've also nearly fried the ECU.
I didn't realise that when I got into the car, I had kicked the OP2 extension cable just enough to have it half in half out... I was lucky that I picked it up after a couple of failed attempts, and with the ignition on, and the cable firmly in place, I managed to flash.
I remember having a couple of stiff whiskeys that night
