Engine painting while in the car?

My lovely car was sold to me with someone attempting to dress up the engine compartment by re-spraying the engine with blue... FORD BLUE that is... :-(

What's the best suggestion for how I can safely strip off the underlying paint (there's some obvious areas where it had peeled and they just went over it), so I can apply POR-15 turquoise paint? I plan to just brush it on based on other people's experience.

Aircraft stripper and masking?