How do I switch out individual items?

To quickly switch out single items, open up your Character pane (default: "C") while Equipment Manager is enabled. Hold down the Alt key and hover over the item you wish to replace; this will bring up a small window next to the highlighted item that will list all available replacements for that slot. Click on the desired item within the window to complete the swap.

As with full set switching, individuals items may only be replaced via Equipment Manager if they are in your character's inventory or if you are interacting with the banking interface at the time of the switch.