Useful advice BPF. I had exactly that problem on my QXC - I couldn't start it initially and so my instructor had to for me (I was terrified of draining the battery by keep trying).
I then was petrified of not being able to start it subsequently after my first and second land-aways (I did indeed have trouble, but thankfully got it started each time).
I'm not wanting to worry the OP, but do make sure you are familiar with the best starting procedure on the aircraft that you will fly on the day.
Good luck!
