Okay I'm a little confused -)
If you're asking about cross processing E-6 film to negative then it's the same steps you need to perform for C-41. I guess you could claim it's easier because the results will be different. OTOH C-41 is pretty easy.
If you're asking about cross processing E-6 to C-41 then just look at any site covering C-41.
Like this one.
If you are a careful B&W worker then C-41 won't be any harder. All you need is a way to keep the chemicals at the right temp. The colour developer is only 3:15 minutes so it's not a long time.