Last summer I tried propagating a couple of blueberry cuttings that broke off while I was working around the bushes. They did not root for me. After I broke off the branches (accidentally), I gave them a clean cut on the end, dipped them in Take Root, then stuck them in small pots (2 inch by 2 inch by 3-4 inches tall) that were filled with a 66/33 mix of moistened potting mix/perlite. One or two had a plastic bag over them to keep the humidity in. I set these in my shed, hot but out of the sun. Then I forgot about them. When I remembered a couple of months later, they were dead, leafless sticks.
How much of the failure was my prep/lack of attention versus the wrong time of year or wrong parts of the plant (too woody), I really don't know. Most of my blueberry varieties are still under patent so I am hesitant to intentionally propagate them, even if it's just for myself.