Can a normal engine be turbocharged?

Could you elaborate on the feasibility of turbocharging a standard, non-turbocharged engine? I'm particularly interested in understanding the technical challenges, if any, that arise when attempting such a modification. Additionally, what are the potential benefits and drawbacks of turbocharging an engine, especially in terms of performance, efficiency, and reliability? Also, would the installation process require specialized tools or equipment, and how complex would it be for an average enthusiast to undertake such a project?