Purchased these in April and didn't install until July. Procrastination because I was afraid I'd find a way to mess this up. From start to finish, it took a total of 10 minutes to do 2 windows. Why did I wait?! They look great, and due to being cut to measurement, they look custom. The semi-circle windows I have offer anything but privacy for the nearby neighborhoods. Installed these and was blown away by not just how easy it was, but how great they look after.Tools needed for my job: 4 rubber bands (2 thinner ones at the ends of the blinds, 2 thicker ones in the middle of the blinds while measuring, marking and cutting), a cutting board (kitchen) to cut these on, a sharp kitchen knife (too afraid to use a box cutter; not a serrated knife, or it might jump off track and cut you on the way back (had 2 close calls and didn't feel like a trip to the ER)), and a small step ladder. Took 60 seconds to measure the window (so true to measure twice), then 60 seconds to cut them, then go to the window, peel off the tape, get on the step ladder, and install in 30 seconds.(seriously kicking myself for not having installed these sooner)