These went up in seconds and look like they were custom-made for my house. My windows don't all have the same trim depth (1870s house, no two walls alike!) so the top brackets couldn't go on exactly flat, but as long as I got them basically on the same plane, the bar snapped into place anyway. Very forgiving system, nice opaque shades, and after years of fighting with cheap Ikea blinds, the rolling mechanism on these is brilliant. Would buy again in a heartbeat.