Chain between camshafts

Has anyone done replacing it himself, is it difficult? Any special things to watch out doing it?
I've heard ,that the worn out chain is one couse why ACE is so noisy and affects how percise valves are doing their thing?

Yes I did. It´s not difficult. But you should have a second Person who lifts the camshafts. Its is very important not twist them while removing the old and putting on the new chain.
I felt a little difference in the engine power. The chain elongates with rising age. The chain has no chain adjuster , so you get a displacement in the valve opening times. I think it is useful to replace it.

Yessss, my old chain was really loooong