Well that sorta sucked...

I wanted to do the 'difficult' side last, so after I had put in the PS header (by removing filteradapter, trans dipstick, idler arm along the way ofcourse), I started reading the manual further for any tips doing the DS header. Only then I read the PS should've gone in first...
Would've been nice if they had mentioned this upfront in TFManual.

One tip I could throw out here that I did, is to leave them in the plastic bags when mounting them. This prevents them greatly on scratches and grease marks.