And, here's how I pressed it!

I ended up pressing the block quite symmetrically with the points of the four diamond shapes going towards the center. That worked quite well. There's a bit of a 'bump' there, but it makes the center gold part of the block stand out nicely, so this will be it. My friend, Joan, has a wonderful professional iron which just gives a shot of steam when you press the button. Worked great. Thanks to all who offered good advice.

Now to finish the chatelaine!