Batch Keyword Removal Advice

Question

Aperture 2.0 seems to have way too many windows, bars, HUDs, panes for keywording, and yet I cannot for the life of me figure out how to easily remove one or more keywords from a group of selected photos.
Today I selected thirty images and added a keyword. Unfortunately it was misspelled. I can't figure out how to remove that word from all the images, except by removing it from each image, one image at a time.
The "Metadata Inspector", that is the pane on the left, only adds or removes a keyword to a single photo even when more than one are selected. This is also true of the popup pane that rolls up from the bottom of that pane.
Both the Keywords HUD and the Keyword Control bar (across the bottom) only seem to allow me to add keywords; they don't list keywords found in photos.
The Remove Keyword command in the Metadata menu only lists some generic keywords, or lets you remove ALL keywords.
The Batch Change command lets me add metadata, but doesn't list keywords for me to delete.
Okay, there are probably another dozen ways to work with metadata that I'm missing. But can anyone tell me how to remove a keyword from a batch of selected images??
Thanks.

Answer 1

I'll put the steps in sequential order
1. Press shift-D if necessary to show the keyword controls in the control bar.
2. Select the photos with the unwanted keyword in the browser
3. Put focus on the keyword entry field in the control bar either by clicking in it or by pressing option-`. You could also select "New Keyword" from the Metadata menu.
4. Slowly begin typing the unwanted keyword in the field. Aperture autofills the keywords. I usually type only the first few letters; Aperture presents a list and I use the up and down arrows to select the keyword. Note that you haven't pressed enter or return yet.
5. Press shift-return to remove the keyword from all of the selected photos. If you had pressed just return, then Aperture would have added the keyword to the photos. Shift-return does the opposite.
6. Notice that focus is still on the keyword field. Press enter or escape to exit the field. It can be frustrating to forget the focus is in there as you press keys to do other things. I do that all the time.
I'm pretty sure there is no penalty for selecting photos that don't contain the keyword you want to remove; in other words, if your selection process includes some photos without the keyword, nothing bad will happen when you do this batch keyword removal.
You can verify that you have removed all usages of a keyword by using the Query HUD. The keyword list in the Query HUD shows only keywords that have been assigned to photos in the library. If you remove the unwanted keyword from every photo, that keyword will disappear from the Query HUD keyword list.
That keyword entry field is pretty useful, especially thanks to auto-fill, which acts as a verification that you are using existing keywords, in addition to being a kind of shortcut. I have found it best to add keywords in the keyword HUD, organize them in a hierarchy, and then lock the keyword HUD. This keeps me from inadvertently adding a keyword. If you add a keyword on the fly, Aperture puts it at the top level of the keyword hierarchy, which is never the right place in my system.