Well, this post is quite old -- but for someone contemplating the same thing -- I'm sure the poster has probably realized his first mistake --
Removing that wooden rail -- you should put damper head blocks on the end of the stickers, on both ends and at the treble break -- you don't want those roaming loose, or you're going to have a hell of a time getting them all back in the little holes -- There might be some variation in design... but from what I can remember, the action is basically screwed into the back of the piano --
Unscrew the knobs on each end -- get the two in the center loose but don't remove them yet -- then look underneath the action and remove the screws attaching the bottom of the action to the piano -- Now go back up top, grab hold of the hammer rail with one hand and remove the other two knobs with the other -- action should lift right out.
Like I said, I don't know if this method would work in this case, as the design might have changed through the years -- but the big reason I posted is because this poster made the fatal mistake of removing that wooden rail and I wouldn't wish that on anybody...
I wish someone had been around the day, I did the same thing
Those who cannot feel the littleness of great
things in themselves are apt to overlook the
greatness of little things in others....