First time visiting England, driving woes!?

Hi everyone! My soon to be husband and I will be taking a trip to England in August. We wanted to visit Stonehenge and the surrounding area, and stay at a bed and breakfast out in the country- which will mean we have to drive! The one thing holding me back from booking this trip is the driving. I'm just not sure if I can do it! Should I worry? We'll be flying in, so we'll be renting a car from the airport. Tell me I'm thinking to much into this??