I just started to make a pair for my sister for Christmas. I am using a worsted weight doubled (gray) for the soles.
So far so good and I'm an average knitters.
I have found that YOUTUBE.COM has been my saving grace for figuring something out when I get stuck!!!!!
Just type in "knitting prairie boots" or "knitting whatever else" you need help with and scroll thru the demos until you find one you like the best (i always save them to my favs on the YOUTUBE site).