I am just finishing set one, thank goodness that set two looks so much easier!
I always iron my seams open and while I may sew them at a quarter inch, I trim them down to 1/8 inch. I am going to do my quilting so that shouldn't be a problem. I'll know that I have to give extra support to the seams.
Another thing I have been doing is to use the templates. When I cut the fabric, I cut them larger then the templates. Does take a few seconds longer but seems to work so much better. Takes less fabric also.