Should I convert my JDM car to left-hand drive?

Usually no. LHD conversions cost $5,000-15,000+, add complexity, reduce the car's collector value, and can introduce wiring and ergonomic issues. Right-hand drive takes 2-3 days to adapt to for daily driving. The only practical reason to convert is if your state requires LHD (very few do). Most JDM enthusiasts drive RHD without issues — passing on two-lane roads requires extra caution.