I'm currently working Chart 2 of the Winter Leaves Shawl, again. I became an expert on just about every way to mess up Chart 1. I finally got it all correct, then starting messing up Chart 2.
When I first starting knitting lace shawls, I chose a very simple one to start with, and then two more progressively more difficult ones. It was a very good way to build lace knitting skills. It's not a good idea to stop knitting lace anything for several months, though. I think it let me back slide. In addition, I'm following charts, not a knitted pattern, so some things I have to figure out myself.
At this point I'd say the important part of Chart 2 is that the count for the stitches on either side of the center stitch is exact, and that you keep an eye on the ends, too. Never lose sight of the center!