This may have been posted before, but my search skills are sadly lacking . I want put new darker/light blocking curtains up. Unsure about how to go about it.

Are you talking curtains or the day/night shades?

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"Ruben"
2404T, 2003 2500HD 4X4 GMC Sierra SLT Crew Cab w/Astro camper shell and 2003 Chevy Tahoe LE 4X2
Far West Texas

Curtains. I am not willing to remove the blinds at this time.

Pinn,Maybe this will work. Call your local fabric store or visit in person. Surely a good seamstress could measure and fabricate curtains for you. This will not be cheap. They should give you many years of good use. You even get to pick out the fabric. Many times our local fabric stores have coupon sales.