PollyV, its all about accuracy and organization. Like all quilts should be, right? I use my "lasagna dish" trick for the pieces and make a cutting form on Excel spreadsheet. In bigger letters and spaced apart! It's the 1 7/8" and the 1 5/8" pieces that'll get you! And the 1 7/8 x 1 1/2" rectangles! (for those I put a label with an arrow on it along the long dimension)
Also I found out the hard way that when you are doing diagonal corners and trimming off the unneeded corner, DON'T TRIM UNTIL YOU HAVE FOLDED THE CORNER ON THE DIAGONAL AND ALIGNED IT WITH THE BOTTOM SHAPE AND PRESSED IT! I only trim out the unneeded part of the added square and leave the bottom piece whole. Just seems to be much more stable and square up so much nicer with the small pieces.
http://www.quiltingboard.com/t-43126-1.htm