A Dremel with cut-off blade or a hacksaw works well. Be sure to wear goggles and a breathing mask. The scrubbing removes grime and oxidation, thus preparing the surface for a crisp transfer and ultimately firm soldering. Then place a piece of ordinary white paper over the blue paper. Follow the transfer paper's directions for ironing.
Pressure Use generally even pressure, but be sure to move the tip of the iron around all the edges.
In my first attempt, I failed to iron the very edge of one corner of the board. Even the thinnest lines of the nearby text transferred well, but the missed spots failed to adhere to the board. Either let the board and blue paper cool off or rinse them in cool water. I tried both methods and they worked equally well. When the board is cool, slowly peel off the blue paper to reveal the transferred image.