How to Roller Blinds
Rather than spending big bucks to get someone to install your blinds for you, why not do it yourself? The process isn't as difficult as it might sound. To install blinds, measure the dimensions for an inside or outside mount and purchase blinds specific to those measurements
Measuring and Determining the Mount
Measure your windows. You need to do this to make sure that you buy the correct size of blind. Use a measuring tape to determine the size of the window. You can either mount your blinds on the inside or on the outside of the casing. If you hang your blinds on the outside, your window (and the blinds) will look larger. Hanging the blinds on the inside gives your window a slimmer look. Inside mounts also allow more light to shine around the edges of the blinds.
Measuring for an outside mount: Measure along the outside edges of the casing that surrounds the window. Measure the exact length from the top of the casing to the bottom of the casing (or to the sill if your window has one).
Measuring for an inside mount: Put your measuring tape inside the casing where the glass of the window meets the casing. Measure the width of the window at the top, middle and bottom. If there is any difference in the numbers, use the smallest figure to base your measurements off of.