https://www.youtube.com/watch?v=YbKb8R0FwYA

Add Rigify in the Preferences menu Edit>Preferences>Addons>Search for Rigify and enable.

Enable Auto Run Python Scripts in Save & Load

When you bring in the armature, it may be tempting to scale it down in Object mode.

Don’t, you want to keep the XYZ scale coordinates at 1 for it to work properly. Head to Edit mode and Scale it down.

Placing your 3D cursor at the center and then changing the Transform Pivot Point in the top middle helps with scaling it down.

Delete bones you won’t be using.

Box Select really helps in moving the bones. Try not to disconnect bones from each other. So make sure the ball of one bone is inside the ball of another bone. This applies for all the bones except for the ones that are detached already.

To see the bones go to the armature man menu>Viewport Display>check In Front

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You can set Snapping to Snap to Volume to help put the bones inside of your body. Position your heel bone the width of your heel and place it on the edge of y our heel.

Rigging tips: Keep a slight forward bend in the elbows and knees so the IK can work properly. Your body should have the bend but if not, adjust it quickly to have the slight bend. You can look at the position of the arms and legs and try to copy them.

After you have position your rig, hit Generate Rig.

You will now generate a new rig which will be called simply Rig. The first rig will now become the Metarig. You can hide it for the mean time.

If you get an error message when you hit Generate Rig, that means you have disconnected this bone. This is common. Simply move the head of this bone to the inside of the head of chest to neck bone (the nearest one in this picture.)

The most common error message to get is a Bone Spine 0004 error.

Then parent to the body to the rig by selecting the body, the rig and Ctrl P>Parent with automatic weights