Can you replace rod bearings with engine still in car?

LOL,I've done 3 cars and a truck this way.The truck and two cars I replaced the rings new oil pimp and they are all still running after many years.As for the oilyness use drip bowls,it will take a few butter contains work really good for this and I used cardbaord to lay on.If you have a couple days to let the oil drip off it helps.