Here is what I have learned: Start with fabric that is wrinkle free. Measure accurately. ALWAYS use the same ruler for the entire project. Use the lines on your ruler, not on the cutting board. I only use the lines on my cutting board to line up the folded edge of the fabric on. Cut accurately. Use what ever anti-slip measure you have to to keep your ruler from sliding as you cut. Before you start sewing, use a ruler to find the 1/4" on your machine. All machines are different, most 1/4" feet are different. You have to find YOUR 1'4" and do whatever it takes to mark it or use some sort of guide so that every piece of fabric goes under the needle the same way. This is how I was taught and it goes a long way in insuring consistancy and ease in matching seams. Good luck in your quest, keep at it and you'll get there!