Clean the window thoroughly with cleaner and lint free towels.Also, use a flat scraper to remove any paint splatters or rough edges around the panes.
For smaller areas or repetitive panes, cut a template out of paper.
Spray the solution or window cleaner on the pane to attach the film. Some kits include their own solution.
Press film into place. As long as the solution is still wet, it is very easy to remove bubbles using a plastic scraper to move the bubbles out. If the solution dries, spray a little more or remove the cling and try again. Blot up any dripping solution from the bottom with paper towels.