The installation booklet would benefit from a clear written instruction narrative in addition to the illustrations. I needed quite a bit of help to install my blind. The staff were helpful when I contacted Velux though. One slight ‘niggle’ - It would’ve been good to have been told at the initial point when I bought the thermally blind that I needed the additional upper brackets for fitting the blind, since my Velux roof light is a very old model. Having to wait for the 2 additional brackets slowed down the fitting process but I’m very pleased with the end result. Got there in the end!! It’s an expensive addition to the window but it looks good.