St Albans half marathon on 8th June

I have entered the St Albans half marathon on 8th June. Anyone who has done this before? If yes, how was it? Was it hilly?

What are your tips for preparation? First one for me but I run 45-50 miles a month on average, at least for the last two months. The longest distance I have run is 13 miles, twice last year.

Will I be OK?