The normal align is ripe for an overhaul. 1) It doesn't work with snaps, so trying to align the center of a face to the center of another face is nearly impossible. You can click and drag the align gizmo around when you are selecting your faces but they don't snap to anything. So you have to "align" and then snap, just…
Alt-N is the default hotkey for Normal Align. The workflow is a little weird. You select a model. Press the hotkey. Click on a face of the selected object, then click on a face of the target object. It'll connect the two spots. The biggest problem I have with that tool is that you have to turn off the smoothing groups or…