Wow. That is truly incredible. A marathon knit if there ever was one. Congratulations!!! It's beautiful, stunning, amazing...I run out of adjectives.
I would take it to the laundromat, put it in one of the big washers, then dry it there. Where would you block it? I really don't think you'd gain much by blocking anyhow, I've made many blankets (most crocheted) from acrylic and they do just fine sans blocking. As always YMMV and others who know more than I do will probably have better suggestions.
I am truly in awe.