If your machine has an adjustable needle and you don't want to invest in a SID foot, you can 'click' the needle just to the left and then line up the center of your foot (assuming there is a mark) with your seam and just concentrate on keeping your seam lined up.
I also use this to get a scant 1/4" seam when piecing (because I like my open toe foot best) - couple of clicks to the right, line my fabric up with the outside edge of the foot and voila - a perfect (well, as perfect as I can get) seam. I like easy!!!!!