Not a problem...
OK im gonna give super noob instructions LOL
Step 1 download rom to wherever you want on your sd card
you probably have this covered
2) also if you want to use it, download kings format all (note: format all is not necessary we can do it manually and i always do, both actually, but its faster than doing it yourself, more on this in a moment)
3) If your rom will let you select reboot-recovery, if not there is an app for that
(spare parts or quick boot i believe can handle this) or power off the phone, then power into hboot (hold vol down then while still holding that press and hold power till you get to hboot) and navigate to recovery from there by pressing volume down till recovery is selected then pressing volume (note dunno how famiiliar you are with hboot, it will run a scan first and find no image, no worries it wasnt supposed to)
4) This is recovery, learn it, love it
(vol buttons nav, power selects) probably says clockwork mod something and is orange and black (WHAT VERSION DO YOU HAVE?)
4a) Newer versions of clockwork mod cannot flash some roms and mods due to a change in script, if you have a newer version just know it may not flash it, its ok we can remedy that easy just letting you know ahead of time.
4b) If you would like you can flash an alternate recovery, if you want to stick with clockwork go to rom manager and select flash alternate recovery and choose cw 2.6.0.1. If you are open to change I suggest Amon Ra 2.3 (less buggy in my opinion) note that clockwork back ups cannot be restored with amon ra and vice versa so if you have a lot of cw back ups you may not want to change. Also rom manger will be virtually useless with amon ra except for downloading mostly and you will do everything manually.
5)
OK in recovery choose back up/restore and make a back up of your current set up!!!!!!!!!!!!! THIS IS MOST IMPORTANT
6) OK still in recovery after the back up...we now want to wipe everything since you have a good back up we have no worries. Wipe boot, system, data, and cache, then/or choose flash zip from sd card and navigate to where you saved kings format all and flash it. Kings format all should wipe boot, system, data, and cache, just automated. I wipe everything 3 times...
7) OK phone is clean and ready for your new rom...select flash zip from sd card, find your kings unleashed rom you downloaded on your sd card and select to flash it
8)Flashed, reboot, enjoy
Notes: When flashing between roms you will want to wipe all of that. If you are restoring a back up it is not necessary though it certainly cant hurt to wipe all of that, at least if you are feeling lazy wipe cache. When updating to a newer version of your rom you can usually get by with wiping cache and dalvik cache (davlik cache wipe is located under advanced in cw, under wipe in amon ra) this way you dont lose all your data
. When flashing themes and mods and kernels wipe cache and dalvik first then flash...
If you have questions just ask