I just changed my oil for the third time today, on my 2012 Focus.
I have ramps I made which lift the wheels about 3" and that is the minumum needed to get under the car to unscrew the underengine cover.
I may add another inch of wood to raise it just that little bit to make it easier.
I let the oil stay in for 5,000miles this last time, and that was too long IMO considering how the oil looked and felt.
I will do it at 4,000miles next time.
I feel I am getting near too old to change it. Just annoying to scamper around under the car!!
I love how I can feel the engine is better right after an oil change. Runs smoother and revs easier.