You do not have to mirror this pattern. It will turn out fine just the way it is.
Trace or print the block onto your foundation paper.
Foundation piece the individual sections. I also iron the pattern pieces for unpieced sections onto freezer paper. In fact, that's how I stumbled across the freezer paper piecing method used in block G-8.
Piece the four rectangle sections together in pairs to form squares.
Attach the pieced squares as follows...
...and complete the center square.
Attach the background fabric (white) rectangle pieces log cabin style around the edges of the square.
Attach the side strips...
...and then the top and bottom pieced strips (with the teenie triangles).
The scanned image: