heater/air box/fan removal

[macdodd127]

I'm getting ready to install Vintage under the dash air in my '69 chevy c-10. I was wondering how hard it is to remove all the components from under the dash/behind the glove and out under hood on the firewall? I'll be blanking out all the area where open spaces will be. I'll be installing Vintage air unit under the dash. Hopefully this won't be too hard to do, as I'm installing new items,,,sorta like starting over. Thanks for any input,,,