So you're not big on Cyanogen?yes you can, but flashing a rom is pretty easy and mikg is waaaay better then stock. plus you have to be careful on what you delete. i guarantee you that you will love mikg. it is much faster and smoother then stock plus it has all of the bloatware removed and it has the sprint's hotspot hacked so you can tether for free.
but if you want to stay on stock then you need to flash the su file found in the guide. to give you permission to delete or alter the system files. otherwise you will not be able to delete the bloatware on your phone. so either way you will need to flash something.
and recovery is what you just installed and used to make a nandroid backup. by press and holding power+vol down and then selecting recovery, you are going into amon ra which is your recovery. recovery is where the magic happens. it is where you flash roms, kernels, and mods or themes on your phone. it is also where you make nandroid backups which is a snapshot of your phone's current state. nandroid backups are great for if something goes wrong or you hate the rom you are on you can always go back and restore one of your backups.
and the nandroid backup should stay on your card for now.
so it will be up to you if you want to try mikg or not. if you want to stay on stock that is fine. either way i can help you if you want.
If I go to flash the SU file, do I have to reformat my SD card, which would delete that backup I made right? Or is the reformatting optional?
Should I regularily make a backup?
If I wanted to check right now, how would I know if I am rooted? By flashing that superuser file?
Dude, thanks a ton for your help, I sincerely appreciate it. You've been super patient - very awesome.