well, I reccommended Carol's 300 block book to someone recently, or I seconded the notion...but the point is: She is fabulous!
Shaverg, the 'trick' with ppr. piecing is having the fabric piece on the underside of your ppr and sewing on the top side. If you think of it as a sandwhich: fabric piece, right side down, ppr on top of that with lines/markings, facing up, (that's the middle of your sandwhich), then your presser foot of your machine, is your top piece of bread, and you stitch on the lines.
The big 'trick' that is hard to get, and hard to explain without pictures: is the way you slide this out from under presser foot, keep it just the way it is,...place on cutting mat...and you fold back the paper, where your stitching line is...many use a piece of cardboard to fold back on, to get a straight edge. with this piece of ppr folded back, to your left, and your fabric face down, on the right, of stitching line, you have enough fabric past the stitching line, to use a ruler to rotary cut a 1/4" seam allowance. ta da! (did u 'see' it? :-D )