The last shop I worked at was a Focus dealer until Focus changed their distribution channels and the shop dropped them.
They had rigid internal tubing, which in theory should have made things easier, but in practice, as others here have noted, getting the cable around the bend for the front derailleur was a real bear. I fought several battles with those and won them all, but it was never fun.
Starting with a new cable with a neatly welded end is a must.