How to Install And Create A Basic Project In Unreal Engine
Unreal Engine Setup
You're need Unreal Engine 4.19.2
Creating A New Project
If you're going to replace a mesh or a texture, open up Unreal Engine and create a new project, name it whatever you want, note the name as this will name be referred as project name from now on.
Your next step on modding is Understanding and replicating the game structure
If you haven't already, Umodel is a must in order to understand where the files are located. Learn How To Use Umodel