No special access issues
The boulders are all situated at the end of a small fjord, that you can only access by boat. The boat leaves every day from Reine, the settlement where you land is called Vindstad.
You can leave your car by the ferry landing in Reine, and take only your crashpad ( and possibly camping equipment - Bunes beach is a beautiful area to camp )
From the ferry landing in Vindstad, follow the trail to the end of the Fjord and then go leftwards up and over the hill ( there is a sign that leads the way ).