Magento is an enterprise oriented system, it really isn't for a non-technical person or for a business without professional developer(s).
This patch, in particular, will likely require a developer. At a minimum you will need bash (unix shell) access to your site, but you really should have a full site (code + database) backup before applying the patch--and you will need a developer to review and implement fixes for the admin routing changes.
PM me if needed