The instructions are pretty easy to follow with the templates. Don't take short cuts on the marking and pinning and I can see where someone might think they don't need to do that but it is important.
It has taken me a couple of days of many hours a day to get this far. Each seam takes thought and checking if it's edge to edge or from dot to dot. There is some speed piecing when sewing 16 of the same part over and over.
When pinning pieces there are dots to line up along the seam and that has been critical too. When I slap two pieces together and think I have it lined up then I go to put a pin through the dots on each fabric I find that I could be a 1/4 inch off.
It's really not as hard as I thought it would be. Just take it slow and steady.