Im a easyrig agent in Brasil.
if you have someone to help its good, first time installations are possible but sometimes the cable touch the hole on easrig arm and becomes dangerous to your camera.
The set up is really confused by flowcine instructions, try going to a rental house or a dealer, the second time that you install will be pretty easier =)
if you have doubts I can try to help from here, or maybe posting some pics.
the key thing is, while passing cable trought arm, using the original cable as guide for the new ( and longer cable )..do not even try without using original cable as guide !
second key tip is be aware that cable isn't touching the hole on arm, if tension is good, you did it right !