Chuck,
It's been more than two weeks since I put mine in
I recall having to take my time and study each little retainer individually. Some seemed to fit "as-is" and others required a bit of grinding to get them on snugly. If they weren't ground down a little, some of them would not go on at all. This is part of what I meant by "hassle". The other part is getting the C-clips on - I had to use the Braille method and some real contortions
One other thing I did was to mark each one so if I ever had to take them off, I could get them back in the same spot; this means marking them so I knew which side faced the head. I did do this once and (mostly) got them back on satisfactorily.
The good news is they were harmless to the heads, and I could R&R the headers if I had to. A real PITA.
All in all they were worth it because header leaks are few and far between now, where they used to happen every other week especially if I abused the car a bit by taking it to the track.
I tried good quality header bolts early on, and they just wouldn't stay.
Tom