Question about flashing a rom (kernel...?)

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http://forum.xda-developers.com – ok, so i just rooted my One X (AT&T) running 2.20 using the unlock-bootloader method (only one out there, right? :D) i want to flash the latest stable CM10 rom (named cm-10.0.0-evita.zip), but i hear all this stuff about flashing the kernel or the boot.img first before flashing the rom...? i've never rooted/flashed on HTC before, so forgive me if it seems noobish. what i have heard so far is to flash the boot.img from the rom i want to flash while in fastboot from my computer, then transfer the zip to my phone and flash the zip from TWRP. this is what i have picked up from hours of web- (HowTos)