Yes, I have used this method but I dampened the block, laid it out on my ironing board, which has an accurate grid cover, and pinned it down, stretching or easing as necessary and making sure everything was square and every piece was the correct size. Then I left it to dry. After it was dry, I sewed it to its neighbours.
I should also say that I haven't done this very often but sometimes those bias edges get away from me.