Yes, I have, and you need a substance to abuse, like glue, acetone, smokes or alcohol. Cause if you don't, you'll abuse everyone else in a 50 km raduius!
It's okay if its a full strip of the interior, like when you put all the XF Ghia bits in. Knowing that you'll end up with something neat afterwards is an incentive. But if its just a stock GL, S or Fairmont without A/C, power doors, mirrors, electric windows, then it'll take two days solid. Plus plenty of drinks.
Don't envite friends over who drop wicked wise cracks. I don't think there is ever an excusse for domestic violence, but the wire swop is!
Seriously, the issue is you have to remove and replace everything , and consult the diagrams from the 226 Gregoires manual. A digital camera helps too.
You can't do the good old Aussie routine of just getting stuck in and doing it the way that makes sense. Do it wrong, and you get to the last wires an discover you cant get the last piece of the loom in. The dash clips and other Nippon Clipons break easily, and it'll rattle like a dawg if you rush it. Beware! The plenumb/crowl/firewall is very prone to rust. The whole section is sound deadend, and you have to remove the whole HVAC unit to get to the main loom. Things like A and C-pillar ground wires take ages to remove, and you start to look at block connectors to cutt main wiring looms when they don't feed through bulkheads.