How to securely root g2 phone (AT&T LGE LG-D800)?

I’ve been looking to root my phone, only all methods require installing binaries from little-known (by me) sites with no Web of Trust rating. I feel hesitant to do that.

Here are some rooting links I found for my phone:

• http://forum.xda-developers.com/showthread.php?t=2448887

• http://theunlockr.com/2013/10/25/root-lg-g2-versions-video/

• http://wiki.cyanogenmod.org/w/Install_CM_for_d800
  requires ioroot: http://forum.xda-developers.com/showpost.php?p=48709232&postcount=869

  The latter one refers to Kingo Android Root (its Web of Trust says XDA does not recommend it until it goes open source due to some suspicious activities such as sending IMEI to the server)

Which of them are safer than others?

Also, there was a manual way to root via ADB, or if there was source code, or if there was a reputable trustworthy site to download from, I’d be feeling much more secure.

I am a Java developer, new to Android development, but it’ something I want to learn, so programmatic solutions welcome.