6. Send commands to fire engine.
What propels the spacecraft(please excuse my ignorance but then I am not a rocketeer) and how do we know that we have enough of the stuff to complete its manoeuvres? Also, what happens if the results of Step#5 do not turn out to be too positive. Do you have any alternate plans of using it for some other purpose...maybe crash-land it into the nearest planet/comet/moon while it keeps transmitting atmospheric measurements?
One way to make your old car run better is to look up the price of a new model.