[KBZL]

Use Fresh Pre Kitchen to root.
Once rooted, download the rom of your choice. Preferred options are Fresh 1.1, TTG, and Modaco.
I prefer Fresh because it just seems to run extremely well.
Once you have the rom of your choice downloaded, leave it in .zip format and transfer to your SD card. DO NOT put it in a folder.
Power off your phone, hold the home button + power. It should boot into Heroc. Scroll down to Apply sdcard: choose zip, select the rom you just put on your sd card, then press the home key. Wait for it to finish flashing and it will go back to the main menu, select reboot. Thats it. You have now flashed a custom rom.