I have decided I want to learn to sew. So I bought Sew U by Wendy Mullin and she suggests that you block it. For my first project I chose to make pajama bottoms, but to get practice I was going to start with a muslin version first. I have not washed the muslin but then she talks about ripping or threading, so I went to try it and it didn't work. I did get it to rip but it made the edges kind of ruffle. Then I tried the threading method and the thread would break after about and inch or so. Do you have an suggestions or is this a necessary step? This is probably just a newbie question but I could use all the help and suggestions on anything about first projects.