I measured the windows. If you have an old crooked house like me, be sure to measure the gap right where the blinds will be installed. Mine are a little loose because I measured the outside edge of the window sill, rather than at the back, where the blinds actually attach, and there was about a 1/4 inch difference. Oops. As long as I pull it gently it doesn't fall down. I will have to get a new one, but at the moment I am too cheap.
Anyway, I took my measurements to Home Depot and found an employee to help me. They actually custom cut the blinds to fit your windows. I grabbed a couple mounting brackets and was on my way. At home, the only tool required was a drill (you could use a regular screw driver if you have some muscle).
I mounted the brackets up in the window. Don't look at my bad caulk job up in there.
In my case, I had enough room to mount the black outs directly behind the honeycomb blinds (yay), so I have separate light blocking and insulating blinds. For lots cheaper than buying new light-blocking honeycomb blinds, by the way. There was just enough room for the roller blind to function. I popped in the blind on both ends and ta-da...
These are the results...
The hallway light was on in both pictures, but you can tell it is a lot darker with the blinds.
An easy way for mommies out there to get a few minutes of peace and quiet!