it is an easy enough task to remove the loom. If possible, as you disconnect the connectors, label them so you know what they should connect back on to. i.e handbrake lever, ciggy lighter etc.
For the roof clock, tie a length of string (or 2 to be safe) onto the loom, and pull through then you should have a length of string that can be connected to the loom and pulled back up the pillar.
take your time and dont cut any wires and you will be fine.