I work with Acrylic yarn a lot. And for some reason, I feel the need to justify this to you. I'll just say that Acrylic lends itself well to the type of projects I tend to make (e.g. 8-bit game crochet, miscellaneous items that need to be durable, etc.). Furthermore, I rarely ever make any sort of garment, thereby making it not economically nor practically favorable to work with cellulose or natural fibers. Lastly, there's that small part of my 12-year-old self that sort of loves the squeaky, grossly-colored variegated yarns of mismatched and puke-styled purples and greens and says I couldn't ever possibly let go of acrylic yarns.
I've almost finished a knitting project made entirely of acrylic yarn. Honestly, I make many things without finishing them properly and I normally regret not putting in that little bit of extra time to make it look more professional. This time, I'm doing it right; I'm finishing my knitted project off by blocking each individual square, and I am sharing the tutorial with you.
Everyone has a slightly different method they prefer for blocking yarn. In fact, some people will argue with you that blocking acrylic yarn should NEVER be done. But, I believe in lightly blocking acrylic. Keep in mind that your blocking will be permanent. I've tried using steam before, and I find that with the yarn I use (most often Red Heart, and Loops & Threads Impeccable), this ends up making the yarn really flat, shiny, and scratchy. Also, you can use this method for blocking other types of materials too!
Here is my method for how to Block Acrylic Yarn: