I'm with KSellers - start out with something-anything! that you won't care what it ends up as. Sheets, muslin, etc. Do lots of doodling - builds muscle memory for those designs and helps you figure your way out of corners.
Give yourself permission to not be perfect when you start, and remember to breathe!
There are also lots of great videos on youtube showing you how to do some of the designs. Here are a few of my favs ...
http://www.youtube.com/user/SharonSchamberNet/videos
http://www.youtube.com/user/renaequilts
http://www.youtube.com/watch?v=GXLCQj--eSs
http://www.youtube.com/watch?v=9hLGeebryLQ
And McTavishing - be sure to see some of Karen's amazing videos!
http://www.youtube.com/watch?v=QjvK1OqQYKI
PinkText:
http://www.youtube.com/watch?v=aLDOS...eature=related
Then throw in some Zentangling on quilts ...
http://www.youtube.com/watch?v=aX9CzJCuIOc