If for individual use, a measure guidance will be given for your reference. Please find details from the link : http://www.oppeinhome.com/oppein-service/measure-space/
Yes, the kitchen cabinet is customized so we suggest you send us kitchen layout plan with detail measurements then we could move forward.
We can send installers to help by charge. So if retail order, we suggest asking local installer to help and we will send the guidance for assistance. It is not that difficult. Please find details from the link : http://www.oppeinhome.com/about-us/installation-info-2/