All the replies to your question are true (be organized, etc.)
I just taught a bargello class that was "intro to the technique" and we did not match seams as in the photos attached. Here are a few websites to look at:
http://www.quiltingandwhatnot.ca/pdf...oBabyQuilt.pdf and
http://www.hgtv.com/crafting/bargello-quilt/index.html