A question about unity prefabs and their animations..

Ok I recently purchased a prefab from the assets store that came along with a whole list of animations. I took that prefab & re-sized individual parts of it in the unity editor to reshape it into what looks like a completely different character. Now the problem is that it reverts back to its original proportions whenever an animation kicks in..What is the easiest way to fix that? Is there any other way to fix that besides importing the character along with its animations into blender to make the adjustments before exporting everything back to unity? I am a newbie & I've never used blender, if that's the only way then my question is how difficult & time consuming is doing all of that going to be & how do I go about doing all that needs to be done?