You guys crack me up. This is far and away the easiest and cleanest car to change oil on I have experienced. NO special tools (i.e. filter wrench) are required, and BMW even designed the engine bay such that you don't need a funnel to pour bottles of oil in (there is an oil-bottle sized void!). The only part that was moderately annoying was pouring 9 quarts out of the pan back into the bottles.
For the allen wrench plugs, to avoid stripping, ensure your wrench completely bottoms in the plug.
Also, I wouldn't bother with the little bit of oil left in the filter. You are basically diluting that oil ~50-100:1 with the refill. Starting the car immediately after the oil change (with no oil in the filter) will cause far more damage than that little bit of used oil ever will.