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Some steps for a UE4 tools rig:
- Install the addon and enable it in the addons panel.
- Select the UE4 Tools panel to the left and clicking Open UE4 Tools, Animation Tools and Append Hero Rig, including the hero (mannequin) mesh.
- Edit the pose of your model so it matches with the mannequinn mesh.
- Delete the mannequinn and parent your mesh to the rig with automatic weights. Fix weights manually if necessary.
- Export to UE4 and retarget animations (if you want) or create your own in Blender.