Go to Craftsy.com, click on the 2012 block of the month free class. This is where I learned to line up my seams. Works every time to get the perfect line. It is all in the ironing of the seams to one side and the opposite pressed to the other side. Then you nest them together and pen. I have found that you tube can be helpful in learning something new. I watch you tube all the time for quilting, crochet and knitting.