Its a whole lot easier if u just change the whole dash loom, it will all plug and play right away, u need the mirrors also if u dont have them.
The climate control has i think 3 motors on the box's, u can either replace the box's or take the motors off hte cut and put them on ur original boxs, u will also need to remember to put the outside temp sensor which sits on the front of the air con fan,
basically replace the whole engine bay parts plus all looms and u will get there no worries