Hi there,
I’m a complete noob to this so please bear with me 
I’ve downloaded a .fbx file of a textured character and opened it in Blender - no problems. However, what I’d like to do is replace the skin texture on the character’s left forearm and hand so that it looks like it’s made of metal (keeping the geometry the same).
What’s the easiest / most noob-friendly way to go about doing this please? From what I’ve gathered, the unwrapped UVs and associated textures should be stored in a .jpg or .png file somewhere (?) so could I just open that and paint the new texture over the top?
Sorry for the cluelessness, I’m very very new to this lol.
Thanks very much and have a great day!