I just installed the New Interiors mod. A word of caution. Those diesels are mighty loud. I removed the sound portion of that mod for the sake of peace of mind and kept the interiors.
Sailor Steve gave you some very good advice about playing stock. Add mods sparingly and with caution. Open mods up before you install them so you will learn what parts of the game are being modified and how. Save your original files so you can go back. You'll soon get the hang of it. It takes time.
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