If you've read enough threads on integration, and goodness knows, there's only a few hundred on here with that subject, you know about all you need to know, really. The rest is going to be experimentation, observation, common sense and trial and error. There is no one, perfect, fail proof method. Different ages, different breeds, different personalities, and so on with endless variables.
Observation, common sense, nice and slow, watch what happens. Be prepared with different pens, runs, waterers, feed troughs, etc. Integration is a funny thing. Sometimes there is a kind of truce, or tense peace treaty without there ever being true integration. Birds that were brooded together always seem to bond in subsets of the flock. That's OK too.