It took me 2 days to install.  I measured before ordering but I ended up having to add wood blocks.  My cupboard's design just wouldn't work as is.  Also the video on this site showed a ½ upper shelf and showed the unit installed without the shelf needing to be removed.  That didn't work in my case either.  I had to saw out that shelf.  I have quite a stash of cookware and not all fit now (they did before but stacked) so I had to downsize and part with some.  I probably wouldn't do it this way again.  I'd use a regular pullout without the dividers designed for pots/pans.  My favorite pan won't fit.  It has a long handle and a short one.  It won't fit with both handles.