Combining Mod Packs?

[Seraph07]

Whenever I try and combine Skin packs, I will extract the skins I want and Replace them over the ones I don't. I open them up, and I see their the right ones. However they are not being read, and I noticed they are taken out of alphabetical order. Any advice?

[Godless Pickle]

How do you merge mod packs in the first place? Is there a tutorial?

[Astaroth]

This is probably better suited for the Textures, Models, Animations forum. Moved.