Sounds good. I just bought it. Hate to have wasted the $$$ on it if I can safely install JB on it.
It's great to learn from, but in the end nothing beats manual installation.
I'll keep my eyes out for your return, but here's what you absolutely need to do.
(1) Make sure that the rom actually downloaded. Get a file explorer type app (Astro, ES File Explorer) and look around. It should be in either the /sdcard/Downloads folder or /sdcard/clockworkmod. Just look around and verify that you have the rom. If you're unsure, download it again or download it manually and place it on your sdcard.
(2) Once that's taken care of, simply hit "Reboot into Recovery" in ROM Manager. Or...you can power down your phone and get into the bootloader by volume UP + volume DOWN + power, navigating to recovery mode, and pressing power.
(3) Wipe data/factory reset. Do that like 3 times, just to be certain.
(4) Wipe cache partition. Again, be certain.
(5) Go to Advanced => wipe dalvik cache.
(6) Go back to the main menu, go to mounts/storage, and tape "format system." Do that.
(7) Go back to the main menu, go to "install zip from SDcard," find the downloaded rom (that you verified earlier) and install that.
(8) Reboot system and setup your phone. Be patient.