I'd unscrew the drain plug on the bottom of the oil pan, but that's just me. Remember there's an oil filter that needs to be replaced as well. It's a round canister thingy that spins on to the engine block. You must refill the engine with new oil while you are at it, be sure to use the right amount and don't overfill. Be sure and do all of this while the engine is still relatively hot so all of the oil will drain out.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)