To be certain, you should:
1. Consult your owner's manual: This is the best resource for the specific location in your vehicle.
2. Look carefully under the dash on the driver's side: Feel around for a small, usually square, black box with a button on it.
3. Check near the fuse box: The inertia switch is often mounted nearby for easy access.
If you can't find it after searching these areas, a quick online search for "1998 Chevy S-10 inertia switch location" along with images might be helpful. You could also consult a trusted mechanic.