If you can use a tape measure and a drill, you'll save yourself a bunch of money going DIY with Blinds Downunder.
The installation process is quite easy and once you've done one, the remaining blinds are a breeze to put up.
They offer great product and material choices, and the online ordering process is user friendly.
This is my second time purchasing from BD and I would highly recommend them to anyone looking for new/replacement blinds.

Approximate cost: $1300