Okay. Here is my re-write...
So to summarize after reading all of this, to make sure I get it right...
Step 1) download and install the one click apk or get it from the market and install it.
http://dl.dropbox.com/u/8699733/erisone010.apk - VERSION 0.1.0
Step 2) Run one click program, read disclaimer, press button.
Step 3) Reboot into recovery mode. Do this by turning the phone off and then turning it back on by simultaneously holding the Vol Down and Power Button. This will boot you up into Amon's Android System recovery.
Step 4.) Using Amon's recovery and the trackball to navigate and select, pick the backup/restore option which will do a Nandroid backup of the current ROM on your phone.
Step 5.) Once the backup is complete, press the Vol Down button to return to the main menu.
Step. 6.) Once back at the main menu, pick "Flash Zip from SDCard" and then select rootme.zip that came with the one click program.
Step 7.) Press the Vol Down button to return to the main menu and select "Reboot System Now"
Step 8.) Once the phone is re-booted, go to settings>applications>development and turn usb debugging on.
Step 9.) Uninstall One Click program
Now you are rooted and will be able to do root-only stuff like install root-only apps, delete bloatware, etc.. But you won't be able to overclock without flashing an overclock kernel patch.
To install a custom ROM after all of this...
Make sure to do a nandroid backup before flashing a custom ROM or doing anything scary / major like remove bloatware (system apps), etc
Step 1.) Download custom ROM to SDCard. Download to the top-level (root directory) of your sdcard. Do not download into a folder it will not work.
Step 2.) Turn phone off
Step 3.) Reboot into Amons recovery mode. Hold Vol Down and Power Simultaneously.
Step 4.) If instructed by the developer, perform the necessary wipes. 2 wipes may be necessary. Wipe Data / Factory Reset and Wipe Dalvik-cache.
Step 5.) Press Vol Down to return to the main menu and select "Flash Zip from SDcard"
Step 6.) Select the *.zip file that you downloaded in Step 1.
Step. 7.) Press Vol Down to go back to the Main Menu then select "Reboot System Now"