When I need to cut a lot of pieces the same size, I mark the measurement line on my ruler with automotive trim tape. It comes in 1/32", 1/16", 1/8" and 1/4" widths, and a number of colors. I can always see the line clearly and quickly no matter what color the fabric is.
I use a wall paper seam roller to "finger press" seams open so they don't stretch.
I have been sewing for years, but am a newbie to quilting, so if I am not sure how certain fabric combos will look together in a project, I photocopy each fabric and cut out paper pieces for a block. If I like it, I cut the fabric, if I don't, I either change around the colors within the square, or bring in a new color.