Oh man that bow was so tough for me to make, lol.
I went and looked at the instructions you posted the link too and they look amazing. She offers alot of different things, so if you did want to buy instructions I would say to buy those. I'm even thinking about buying those, lol.
There are alot of free instructions out there, however, I think buying them is better than searching for them all over the internet. I've already bought 2 different instructions which come out pretty expensive and the ladies on ebay that you posted seem great. Though I would ask her questions before I bought them to make sure its not too good to be true.