I got BSA extractor and extracted the Trex.dds (1-3, + the _n and _m files for it, and the meshes) and the Triceratops.dds files (and meshes)...from the Skyrim monster mod. I only wanted the dinosaurs from it. I removed the mammoth textures/meshes I had and moved in the Trex and Triceratops files into their place in the appropriate folder. But nothing changed, mammoths are still mammoths.

Was told BSA extractor was easy to use, but I seem to be missing something. I have no skill at modding, and can only do very limited things (I can change armor and weapon values, and...that is it). I do find Wrye Bash easy to use (very easy to learn), but that is far easier for me than actually modding something. I extracted everything that said Trex and Triceratops, but nothing changed. So maybe I must be missing something. Can I use Wrye Bash instead for this?