Use plugins, for example:
https://blendermarket.com/products/grid-modeler
https://blendermarket.com/products/decalmachine
https://blendermarket.com/products/definitely-eevee-materials-system
and other similar ones that allow you to speed up the workflow.
This tool https://color.adobe.com/create/color-contrast-analyzer it will also be useful and at least avoid gross mistakes.