I got to this thread a bit late for any input... since you are apparently already hired by an airline!!!
Congratulations!!!
Just wanted to let you know I've flown in an A320 with captain for a 121 passenger airline, who was in a similar situation to yours (C172 fire)... He does everything just fine and also flew the B737. The only slight difficulty he has is with the radio freq. knob, and some of the buttons for the FMGS.
Anyway, you've gotten through the training, so you are able to do it. Good job.
Whenever I fly with this captain again, I'll tell him about this story so that he might get in touch with you for any suggestions/advice.
You will make a great airline pilot with your positive attitude and love for the profession.