I love paper piecing. I have made many quilts, wall hangings, etc. using this method. I have been quilting for 15+ years (almost exclusively paper piecing) and I still would not tackle a Judy N. pattern. Even her "easy" ones take some skill. Practice, practice, practice. The Judy N. quilts are gorgeous, but can be tricky to work on. You want to start with patches that only have 6 or so pieces in them. Then you want to practice attaching the patches to each other so their seams/points match up (this can be a challenge)...hint: use plenty of pins. (I even sometimes baste patches together). Use decent quality paper to print your foundations on. I tend to use regular copy paper, but then again I've been doing this for so many years, I'm used to pulling off the paper. (Carol Doak sells paper that is very nice to work with). Change your machine needle often as sewing through the paper can dull them. If you make a mistake you don't need to trash the entire patch. Pull out the stitches on the mistake. Then take removable Scotch tape (blue plaid roll) and tape the line you sewed incorrectly on the paper (printed side). Resew correctly. Most important thing in paper piecing, make sure your fabric completely covers the section you need it to.
Can't think of any other tips. Hope the above ones help and are understandable. Good luck on your project. You will love paper piecing, especially on designs that have lots of points...paper piecing makes that sharp, always.
Anita
P.S. Carol Doak has a Yahoo group for paper piecing - a great group of folks, too.