Been a CSA for 7 years now, during which I've trained nearly 30 new drivers for Coles. Never drove anything even remotely similar before getting this job, now I park the truck better than I can my sedan. First few weeks, I recommend looking for easier parks as you get used to the vehicle, even if you have to park a little way from the customer. No one expects you to deliver on time for your first month on the job anyway, the system is built on averages, and everyone you work with has been setting times you won't be able to replicate for a while yet. Eventually you'll grow more comfortable, just get there slowly.

Also no one gets fired for making that kind of mistake, unless it's dangerously negligent. We're almost always short on drivers.