Bo, that is correct. You just want to loosen the ALDA locking nut slightly, so you can get your fingers in there & spin it off by hand. Don't ever crank the ALDA or nut very far when it's tight or you could destroy the top of the pump - don't laugh, a guy in Tennessee (?) did this on a 3.5L recently, while trying to remove the ALDA so he cound change his shutoff valve!
Tip: If you can't get the ALDA out once it's loose, you may need to loosen the injector lines at the pump, for lines 4, 5, and 6. Then pry them up gently while wiggling the ALDA out. You may need to loosen the bracket to the intake manifold if it's present and clamping the lines in place like it should (many don't, the plastic clips are long broken). Also, the new shutoff valve won't include a new O-ring, order one separately. And the new valve has its fitting on the top, not the side, so you'll need a few inches of 3.5mm ID rubber vacuum hose as well.
Have fun,