Installing Mini Blinds Measuring The first thing to do, is to determine the position of the mini blinds, deciding if they will be inside or outside of the window. Insi bean bags de mounting will look more customized, although outside mounting will provide better control of lighting. For inside frame mounting, measure the width between the poin cash back credit cards ts where the brackets will be placed; top, middle, and bottom. Record the narrowest of the measurements you receive.