I'm only an amateur but I understand that you do it by painting the item as per normal, then rub it all over with sandpaper, rubbing the sandpaper harder in some places to achieve that "distressed" look.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local