***EDIT3: Crisis averted. Message below left for posterity in case anybody else encounters a problem mid root and is afraid to sneeze.***
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Crap crap crap. I got to the point where I was telling the phone to choose zip from sd card. I chose it. I told it Yes, install it. It tried to. But then it said:
E:Can't open /sdcard/su-2.3.6.3-efgh-signed.zip
(bad)
Installation aborted.
Tried a few more times and no good.
I'm trying to back out of it, but I just get to the screen where the top option is "Reboot system now" and although there is a "Go Back" at the bottom, I can't go any farther back. I'm afraid at this point if I do anything, I'm going to brick it. What do I do? I'm going to post this here but I imagine nobody's watching, so I'll try over at xda too and in other spots on this site and see if I can get any help. I imagine I can just reboot, but what will that leave me with? Nothing? Something? Something horrifying? Hallllp!
EDIT1: Screw it. I chose reboot. I has rebooted just fine. So I guess it was an attempt that simply didn't do any harm since it failed. I am going to redownload the su-2.3... zip and try again. I will say that my computer didn't want to recognized the drive after I told the thing to install Clockwork Recovery. I don't know if that had anything to do with it. It was fine before when I was loading the su zip on.
EDIT2: Rebooted computer, redownloaded the su...zip file and tried it all again. I noticed when I was deleting the original su...zip file from the sd card that it was only 6k. That's an issue because the original file was 290k. So it really was bad. Don't know how that happened. Deleted that and replaced it with a fresh, full sized zip file. Ran Revolutionary. Revolutionary said "Your device is already S-OFF, what exactly do you think you're doing? Not setting S-OFF." (guess I got that far last time before I crapped out). And then it asked if I wanted to download and flash ClockworkMod Recovery. I said yes and Revolutionary crashed. Did it two more times and it crashed, crashed. I let it send the error report like I wanted, then tried one last time. It worked! Then I did the steps on the phone again where you have it install the su...zip file. This time it all worked. Superuser, *****es! Yeah! Thanks notluK. Very helpful overview you've done there. Nice and plain Englishy.
By the way, those of you who tuned in to EDIT1, my computer kept making the mount/unmount this second time at the key action points during the process and trying to tell me it didn't recognize the phone as a drive via usb. Malfunction blah blah blah. But at this point all the action was happening on the phone anyway, not on the computer, so it didn't really matter. And now it recognizes it again just fine now that I'm done. So it wasn't a fluke the first time - that's just how my computer does, I guess.