Now there are lots of ways to block blankets.
Lots of people like to pin them to towels and lay them out to dry. I tried this with the 1st blankets I done, but I didn't like it. I found that the towels didn't stay flat, so the blankets didn't stay in shape. It also took them forever to dry as one side now had a wet towel stuck to it!
So I decide to try something else. I prefer the use of a collapsible washing line and a load of pegs. This way the blanket stays in shape. It also means that it has air on all side so it drys faster. And as mine is easy to move I can move the whole thing in and out of the sun/wind.