Root Need help rooting xperia z3 version 5.1.1

[nagaspeed]

I tried searching on the forum but I couldn't find any good result. Perhaps someone can direct me to the right direction. I also search online and I read several articles and it appear that 5.1.1 is a lot harder to root then 5.0.2, so I'm trying to be extra careful and ask for help before I attempt anything.

any help is greatly appreciated and thanks in advance