I tried the papers once & I'm sure it was just me, but I found it slow going.
If you use the search at top of this page, just type half square triangles to find several diff ways of making them.For a beginner, the method of making them a bit bigger, then squaring the block by trimming it down is one way.You don't have a lot of waste,but find the way that works for you.
PS....if you have a printer,there's a site on line that has free papers & you just print out as many as you need.