May I make a suggestion. Since you have not made one before, maybe try making the pattern from Quiltville:
http://www.quiltville.com/scrapbargello.shtml
It's not as intricate but I think once you do one, you will understand how to do the complicated ones. I participated in a block swap once using this pattern. I had to read through the instructions a couple of times then do one and then the light bulb came on!
I know exactly how you feel. Sometimes it takes several explanations before something clicks in the brain.