Visited the website, downloaded apk, installed on my XperiaSP .205 Indian-HSPA latest FW and rooted. Simple as that... All the credit to the man who made it possible...obviously.
then installed busybox using flashtool
installed this particular CWM package "http://d-h.st/g8D" [credit to the uploader] and if you ask why this particular one then let me tell you I tried the latest one from here "http://forum.xda-developers.com/showthread.php?t=2649923" but for some reason after installing this my phone is getting switched off every time and then to turn it on I had to press the power button on the back side of the phone first till the phone vibrates thrice and then it switches back on to make me repeat the procedure again
then flashed SuperSU-v1.99r5 and done.... so far evrything is fine, no issues faced.