I've looked at this drawing
http://www.spangerum.com:7080/navi?C...=9&WINDOW_ID=1
I can't see it's too complicated, remove first at pedal, fix top end of new cabel to the old, remove cabel from trottle and pull up. Fix new cabel to trottle and fix gommet to hole in firewall and cabel at pedal.
Know it sounds easy and a lot of craling, swearing etc is involved.
Good luck
Erik