We had a very old Velux blind in our window and it needed replacing with an up to date black out version. The website was easy to navigate and instructions on how to find the correct type of fitting was very helpful. I inputted the details directly off my Velux window and the correct option came up together with replacement side bars for the blind to sit in. After removing the old blind (and the old wooden side bars), it took me 15 minutes to install the new blind and side bars. The enclosed instructions were easy to follow and all I need was a PZ2 screwdriver to fit everything. Don\'t use an electric screwdriver or drill (this is clearly stated on the instructions). Very happy and highly recommended.