92 Toyota W/V6, but I want a 4 cyl!!

I have a 92 Toyota truck, it has the V6, but I want a 4 cyl!! Can I switch motors, if so what kind of work am I looking? And does anyone want to swap parts, motor, electronics, trans!! I'm mostly worried about the motor, can I put a 4 cylinder in and what kind of work am I looking at? Any help please!

Thanks