First time ever using a product of this type. I bought it for the two windows in the loft. It was slightly tricky to do because of the angle of the velux windows, however did manage it on my own! Fitted it yesterday and it is much cooler and comfortable up there for sewing and crafting. Active windows sent the product very quickly. I watched their YouTube video a few times which helped enormously, thank you! I was happy with the price and free delivery and came packaged safely in a sturdy tube. The thing I would do differently next time would be to fit the film to the windows when it is dark outside as I didn't notice all the bubbles I'd missed until the evening once the interior light was on. I wish I had known that before fitting. I would recommend and would purchase again.