Hi Kaml.
Yeah, it's a bit confusing when you first go to it. If you dont like the adrenaline/fear/expectation mix, better is to ask someone else to do it for you
You say that's too complicated to root with a locked bootloader. That’s not always true, it’s relative. The post I linked to you is very clear and it’s not complicated at all, but you will need to start from a 4.2.2 rooted ROM, maybe that’s the complicated part for you.
Anyway, I suggest you to confirm if you can unlock your bootloader. Did you checked it already? It may save you time by knowing it beforehand.
To check, go to the dialer and type: *#*#7378423#*#* then go for Service info > Configuration > Rooting Status. If Bootloader unlock allowed says Yes, then you are able to unlock it. This is from thread
http://xdaforums.com/showthread.php?t=2484622
Read that thread, especially when it says “before unlocking please take backup TA partition from here”. By backing up the TA partition you can restore it later if need and then you have some chance of not losing Sony warranty if you ever need it.
Im not aware of other methods for rooting 4.3 besides the link I posted on my first reply, take a look and you will find other methods (probably).
Anyway, if you are interested in backing up the TA partition, it’s only possible if you have a rooted phone already and that’s kinda of a chicken/egg problem so that’s another motive of seeking for rooting methods without touching the bootloader at first. One way to solve it is to half root your phone, enable USB debugging and Unknown Sources from development menu, then run the script to backup the TA partition.
