No! You haven't put in the new oil yet! Unscrew the oil cap from the top of the engine, insert the funnel. Pour about 3 quarts of the new oil into the engine for starters. After that, top it off after checking the oil level on the stick since there is likely to be a small bit of old oil still in the engine. This will prevent overfill, which can cause as many problems to your engine as having too little oil.
Once you've installed the appropriate amount of oil, start the car and let it run for a while. Check underneath the car for any fresh oil leaks. If leaks exist, double check the tightness of the drain plug and oil filter.
Now am I finished?
Yes! Congratulations! You've just changed your own oil. Now, kick back, relax, and think about all the money you'll save while everyone else is wasting their time and money in the waiting room of the oil change shop down the street.