I took apart the dashboard of my 96 civic to replace the foam in the air vent controller box. It was a royal pain in the ***. I did it all by myself. It took two complete days. One day to remove the dash and replace the foam and the second day to fix everything back together.
Fortunately I had the service manual at hand so everything went smoothly, except for a 10mm bolt that held the dash right at the base of the windscreen. It could only be removed with a T-bar socket wrench, which I didn't have. It took me half a day to get hold of that wrench so I could remove the dash.
Best of luck with your DIY.