I did and let me tell you guys it hurts. It has actually caused me to miss a run because they so painful and on the backs of both my heels. I went online to see what I did wrong and this article gives some overall tips on avoiding these and includes other information like how and why they happen. It also mentions other places and how to handle them.
Blisters are also caused by friction, heat and sweating. Most of the same preventative measures apply, but walkers will try almost anything to prevent blisters.
Stay hydrated - Same as above, be sure to stay properly hydrated including sodium replacement if needed.
Shoes - As with many other walking ailments, begin with the shoes. Your shoes must fit properly to avoid blisters. Too snug or too loose is always a problem. Ensure that there is ½ inch space between your longest toe and the end of your shoe. Be sure that you have enough room to wiggle your toes inside the toe box, and your heel does not slip when you walk.
Choose shoes that breath well. I like shoes with a lot of fabric or mesh combined with leather rather than a solid leather shoe.
Inspect the inside of your shoes for seams or worn areas that might produce extra friction...
It says that they also sell specific socks and other gear which can help prevent blisters. A few other runners suggested body glide to me. There is dry looks like deodorant and wet which works like a spray. I looked it up and you can get it at Walgreen's for $12 but I found it randomly at CVS for under $7, hey every little bit helps. If you are prone to blisters in certain areas the experts suggest taking extra precaution with those places. Happy trails hopefully blister-free.