On the difficulty scale of 1 to 10, 10 being the most difficult; how hard is it to replace worn valve guides on a 3.2?

I understand if some one has little or no experience, a tune-up can be quite challenging. Although I am not an expert, I have successfully performed major tune-ups, brakes, wheel bearing, automatic transmission rebuild (non P-car), water pump, timing chain...etc. I have never attempted a valve guide replacement on a 3.2 P-car.
Can this be done with the engine in the car?
let me know your thoughts.

Thank in advance.