I use this little program, and it works just fine for OE.

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Okay, brought in the big gun and even he was surprised at how bizarre and diverse the lighting is throughout the entire area. I felt vindicated! So, we are going with some of the original colors I selected, but in different places--- Utterly Beige for the counter wall and the center core of the circular floor plan and two of the bathrooms, the walls in a large reception area and under the chair rail in two smaller reception areas. Realist Beige in the break room, a work alcove and another staff bathroom, and two very small offices in the back. City Loft for the exam rooms, which all have west facing high transom windows that make the color look not gray. Finally, Kestrel White for the hallways around the central work core, the largest office and the walls above chair rail in the two small reception areas. All the colors flow from one to the other on a continuum, and define areas---- work spaces are one color, public restrooms another (same as each other) color, reception areas painted alike, etc. We are also going to use Black Fox on the drawer fronts of some cabinets. These are odd sizes of cabinets that are in very good condition but are horribly dated looking --- oak with thin white Formica fronts on the drawers, I'm sure you've seen them. We are going to try priming these with Xim, taping off the fronts and painting the white bits in Black Fox. If it looks ok we're going to turn this over to the painters as well. I don't want to have drawers made for cabinets that we'll eventually change anyway, so I am hoping this will look good "enough" for a few years. Paints all look good with carpet already chosen, new door hardware already purchased in brushed nickel, new bathroom lights, fan, etc. Now we are going to measure for the new countertops --- found the perfect Formica that is white, beige and gray. Painting commences a week hence, Friday at 6pm, as we have to be back in by Monday at 8 am. The next weekend is the carpet, and the next is the counters (I hope)! Keep your fingers crossed that it all goes within a hitch. Well, without too many hitches :-)

Sorry your photos won't load : ( Hopefully, you tried blubird's advice. It's been years since I've reupholstered. My sofa backs were attached using a somewhat flexible metal tack strip. Maybe, your office chair is attached similarly. As blubird said, a flat blade screwdriver should work for this. Two tools that helped with my projects : a staple remover (that looks a lot like a screwdriver) and needle nose pliers. Wearing gloves helps a lot, too. Be cautious - the metal tack strip can be very sharp. I'll post a few pics from a sofa back removal that may help visualize.