What is the rule of thumb for priorities?

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So, now that the mod limit fix has been discovered, I am doing a lot of mods including more texture based mods. I know that the ones that I get conflict with others in some way or another. Like, for example, one of the female's face improvement texture conflicts with the hair or eyes. Am I correct is thinking that I need to set the priority for one of them to be lower (in numerical terms) than the other?

If so, which one should go first? Do I also need to put a list of the mods in here that would conflict so I get the way I need it to be correct?
 
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