How do you set the timing on a 2003 Nissan Sentra 1.8l engine?

To set the timing on a 2003 Nissan Sentra 1.8L engine, first ensure the engine is at top dead center (TDC) on the compression stroke for cylinder one. Align the timing marks on the crankshaft and camshaft pulleys according to the specifications in the service manual. After installing the timing chain or belt, double-check the alignment of the marks before reassembling the engine components. Finally, start the engine to verify proper timing and listen for any unusual noises.