Painless wiring???
I did a painless kit in my 69 dart. Wasn't too bad but if i didn't have 12V circuit experience it may have been harder. There are some spots where it is just not explained and you have to think about it for a minute. but if you have a wiring schematic and voltage tester you should be able to figure it out pain free ...
After my research I probably would have gone with an American Auto Wire kit though