Where to get it cut for free? How handy is your brother-in-law? If they were mine and I decided to cut them, I'd pull them up as tight as I could , tape with masking tape and run a hack saw through them or, a cross cut saw if I had one.

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Here is a link that might be useful: Window blinds

I cut them all the time with my chop saw. As posted, tightly bound and marked, a hacksaw with a sharp blade will also work.

Get them even on the edges and tape them tight to stay that way and they will cut evenly. Cut some off each end so that they still look even.