I did it once, about 15 years ago. I can't remember exactly what I did, but the attached instructions seem to ring a bell.

Here is a link that might be useful: How to shorten a bamboo shade

I just bought the Penney's Cape Code roman shade. It's too long for my window also, but here is what a reviewer said on Penney's site: "I shortened all of them to fit my windows - hot glue gun, scissors, and a tape measure is all you need." You can see them at JCPenney.com.

After looking at mine, it seems doable. Not sure if you have the same style though.

I recently shortened several sets in our new rooms, and those directions aren't right for the blinds I used. Mine had threads weaving the bamboo together rather than wires, and little wire 'loops' that directed the cords. What I did (that worked perfectly) was as follows:

1 - First, we hung the blinds, extended them to their full length, and marked where we wanted them to end with a piece of masking tape.

2 - On a large flat surface (I used a bed, covered by a sheet of cardboard), turn the blind over so you're working on the back side. Then, about an inch longer than the finished length, run a bead of hot glue across the threads to keep the blind from unravelling. Make sure you've got good coverage. Cut the extra blinds below the glue line.

3 - Find your desired end length and fold the bottom inch back up to make a hem. Use hot glue to glue up the hem, using 'chip clips' or clothes pins to hold the hem in place. If your blinds are very thin, you may have a better look with a hem rolled around a small dowel, but a simple fold works well for thicker bamboos.

4 - Now for the cords. When pulled up, the blinds folded in certain places by pulling the cords through little metal loops. The loops were spaced every 12" or so, then when raised, those loops stacked one over the other, forming the pleats. Fold your blind (using the loops as guides) to see how the pleats form and where your new lower edge hangs relative to the remaining loops.

5 - Remove a set of loops from your 'scrap' portion of blind, and re-position those loops near the new bottom so it hangs nicely. (If you're totally confused, try a spot 3-4" above the bottom edge -- that'll generally hang behind the other folds and you can always move the loops if your first guess is wrong.)

6 - Then rehang the blinds, raise and lower them, and shorten the pull-cords if needed.

Wow..I think you've got it exactly! These directions are correct for the type of blind I purchased....thank you so, so much!!!

I didn't know that you could shorten them and didn't buy them because I didn't want to pay for custom made. Now I can put some in the family room. Thanks for the directions.