I'm still a noob at all this...
fastboot oem lock - easy
fastboot oem rebootRUU - easy
fastboot flash zip firmware.zip - The firmware that was downloaded must be in the fastboot directory folder and called 'firmware.zip'. Right?
fastboot flash unlocktoken unlock_code.bin (you need your unlock code to unlock bootloader again) - This is the same bin file I initially used to unlock the phone?
fastboot flash recovery - This is the same recovery file I initially used when I rooted the phone?
fastboot flash boot (boot.img?) - Like when I normally flash the image of a new rom?
flash rom and gapps in recovery - As per usual?
I would suggest backing up your virtual memory card, should you run into any issues, and remember, the community is here to help, so don't panic if something goes wrong
Also, the first flashing of firmware.zip might give an error, so I believe you have to flash it twice together (once, then again right after it) for it to work
PS: the boot.img mentioned should be the boot.img of the Rom you are intending to flash, and the recovery will be CWM/TWRP
Sent from my Bladed One X. Blade v5.0.0 is here. Based on RUU and with OTA.