Hi all, i need to replace a row of new eternit roof tiles. I redone my whole roof and on the back of the roof i messed up the bottom row and need to take out and replace. How is it possible to retreive the tiles from under the other ones and more importantly how do i refix them via the 2 nail holes as i wont be able to get to the holes through the next row of tiles above. Please help my missus is doing her nut