I'm honestly very lost and don't understand the
tutorials on these tools on how to update to 9.2
First, you need to set up the Homebrew Launcher on your 3DS (use the starter pack). Pick one of the ways to do so from
here.
After that, you need to grab all of the 9.2.0-20 update files for your region from "some iso site." You'll also need
SysUpdater.
Place all of the update cias inside a folder on the root of your SD card named "updates" without the quotes. Place the SysUpdater cia on the root of your SD card as well.
Now, you have a few options for this next step. You'll need Pasta CFW,
Mini Pasta, or rxTools (if using rxTools you MUST use Devmode/Pasta Mode to update! Otherwise you'll brick your 3DS!) set up. For simplicity purposes, I'm going to use Mini Pasta in these steps. Create a folder inside the "3ds" folder on your SD card called "MiniPasta" without the quotes. Place the Mini Pasta files inside this folder.
If you're using Mini Pasta, you'll also need
FBI. Copy the "3ds" folder from the FBI download to the root of your SD card.
Now you have everything you'll need to update. Boot the 3DS and boot the Homebrew Launcher. Boot into Mini Pasta. From there, boot the Homebrew Launcher again.
This time, select FBI. Use FBI to install the SysUpdate cia to your SD card. After this, reboot your 3DS. Note: if FBI is failing to install the SysUpdater cia, you'll probably need to do this step first:
You will need to go to the "Nintendo 3DS/<id0>/<id1>/dbs/" directory on your SD card and create empty "title.db" and "import.db" files. Then, go to System Settings -> Data Management -> Nintendo 3DS -> Software on your 3DS and let it repair the database files.
Boot back into the Homebrew Launcher and boot Mini Pasta again.
Now, start SysUpdater. Press A and allow it to update. Wait for it to finish.
Once it's finished your 3DS will automatically reboot. Once your 3DS reboots, check the system settings. You should now be on 9.2.0-20!