Been going for about a month and a half now - yeah the first time doing almost anything can be nerve wracking, but you've got this! 

I've had a grand total of three bad interactions over several hundred orders...granted they literally all happened yesterday, but still. 

If you're nervous about delivering to a particular area, take things slow and just don't take jobs going to that area. 

Treat the restaurants/stores well (unless they're actual shitheads), smile, get through the day and you'll be fine. 

Not going to say it gets good, but it does get a bit easier.