[Koha] Upgrading from Koha 2.2.x to Koha 3.0

Hello, Is there anyone around who remembers upgrading from 2.2.x to 3.0? I have been following this -> http://wiki.koha-community.org/wiki/Upgrading_2.2 but there seems to be some omissions. The biggest problem I see is that there is no mention of where/how to run upgrade the 2.2.x directory structure to version 3.0. There is no mention of running 'make' or 'make install' for the upgrade. That would suggest that any customisations made on 2.2x will be lost. This document seems to be directed at migration to 3.0 rather than an upgrade. Does anyone remember? Thanks Barry http://www.oslo.ie