Nervous build up to driving

I passed a few weeks ago now and work have given me a van to drive to and from the job that I’m currently on. However, whilst driving I feel ok, maybe a bit nervous (as most beginners probably are) but just sitting here the day before work thinking I’ve got to do the drive all over again and worrying I’ll do something wrong in the work van (whether that’s speeding or even causing an accident) is keeping me up all night. Has anyone got any coping methods or suggestions as to what I can do to stop me worrying so much. Thank you in advance