Kitchen Knife Handles

[Sundog57]

Hi
I have several kitchen knives that have handles that are coming to the end of their working lives. Rivets are loose, the wood has eroded (after thirty or forty years of service) etc.
They're stainless and still have lots of good steel.
Is it difficult to put new scales on them?
Can someone direct me to where I might purchase rivets, material for scales, micarta (or something else if micarta is not a good choice) and where I might find good info on crafting new handles.
and... is this a worthwhile endeavour from a practical point of view, or should I just retire them - Grohmann's has lots of new ones LOL
Thx