Set the engine to TDC by rotating the crank pulley, take off the chain tensioner located right below the alternator. Mark sprocket, chain and cam shaft then take off the sprocket from the cam shaft. Don't let chain drop to the crank shaft but put it in the chain 'box'.

There's also a long hex bolt by the sensors and one at the rear of the engine. you also need a 6mm puller for the pins holding the top chain guard rail.

It's easier to unbolt intake manifold from head to minimize unplugging too many parts.

There is a dyi article on this site on how to replace timing chain. Different engine but the same principle.

Goodluck.