I have started writing the instructions for Sincerity Lab here:
https://steemit.com/steemdev/@andybets/sincerity-lab-instructions-part-1

Hopefully this and future posts will give a better idea how to use it. It will only be useful to some people, and I don't expect many users will find enough value to pay for it, as you still need to be quite analytical, but it's there for any who do :)