I don't really like to block and I totally half @$$ it
. I just lay it as flat as i can and take a hand towel (nothing too thick) lay it on top and use a regular iron on it's steam setting and i just go over it and hope for the best. So far nothing horrible has happened. I've also had similar experiences with the stretching or loosening of the fiber were i steam iron it when it's wet. If i want it to loosen or stretch a lot i'll go over it a few times pressing down a little bit and moving the iron in the direction i want it to stretch in. But if i really don't want a lot of stretch or loosening i just go over everything really lightly and quickly.
Oh and to add a poll you click the "new thread" button and you're on the page were you type in your post you will see at the bottom right above the button to post your thread a box you can check off to add a poll to your post.