Flight
Edinburgh International will be the most convenient airport to fly into. There are ample car rental agencies at the airport but the city is easily accessible by Uber/City cab. Hawick and the Scottish Borders are accessible by car or bus.
Travel Note
Branxholm Park House has additional accommodations for families who wish to stay in Hawick near the wedding venue. Airbnb has a wonderful selection of rentals in the Scottish Borders with great views of the Scottish landscape. If you wish to base your stay in the city of Edinburgh, the venue is roughly a one and a half hour drive.