If not using purchased mechanical drawer guides, I have always built and used bottom drawer guides and rails (see drawing). However, I getting ready to build a small cabinet and really want to use side rails but since I have never used them before, I thought I’d get some advice from those who have. My primary question concerns how you attach and more importantly what’s the process that you use to get the drawer properly aligned and then attach the rails to the sides. Also, for a small drawer made of hard wood with flush drawer fronts, how much side clearance would you leave for a drawer front that is 2” x 9”? Thanks for your help, Ron