Thanks to Bill for his review.
Thank you, Karl, but it was Gino's review, I just edited it.
PE thickness varies enormously from manufacturer to manufacturer. While I can't comment in specific on this set or Karl's work, but I can say that several steps will help with PE:
1.) Heat the PE over a flame such as a gas grill lighter or a medium gas stove until it turns red (but be careful not to hold it there as it will melt). This will make the PE easier to bend.
2.) Make sure you have a etch folding tool. It really makes the job easier and avoids over-bending the items.