OMG! So sorry it took me so long to reply, I haven't checked the forum in ages! (Well, that's pretty obvious!

)
To answer your questions:
Yes, I got it all squared away, thanks!
Yes, I did the 2.3 Gingerbread update using Kies Mini. You were correct, I still have no idea about how to flash the ROM.
I was able to return the phone back to stock using Odin. I followed this instructions on the link, which then took me to XDA Developers for some more instructions from XDA. It was somewhat complicated, and after a few panic-filed minutes (due to my not entering something where it was supposed to go and getting the yellow-triangle-warning-screen from hell - then starting over and putting in the right information in the correct place), I finally got it done!
I still have my Infuse, and even though it glitches sometimes (maybe due to the number of apps I have downloaded) I still love it. If I decide to get another phone, I think I'll go with the Galaxy Note (bigger screen

), and pass the Infuse down to my son.
Thank you! And have a Happy Thanksgiving!