Help ? D950 How to SAFELY update to KK? Don't want to bork it.

[zapjb]

I don't want to bork my D950. So I'm asking for help.

LG Flex 4.2.2 D950 AT&T rooted using TowelRoot. And TWRP loaded with older version of Freedom Flex.
Big thanks to mattwheat & PlayfulGod for SAFELY getting me to this point.

I have Titanium Backup Pro & have frozen or uninstalled a bunch of stuff. Should have just frozen not uninstalled, my mistake. I am also on an AT&T MVNO & will not receive KK.

I've read & read & read. So my confusions are:
1. since my stock D950 is missing some apps system & otherwise. If I could get D950 KK it would bork because some JB apps are missing?
2. This is silly I don't understand what a TOT file is. It seems to be LG proprietary. I think it's a stock ROM? Not sure. I've looked.

I've downloaded LGD950AT-01-V20b-310-410-MAR-22-2014+0.tot at 3,065,344 KB from https://docs.google.com/file/d/0B1sK...bkU/edit?pli=1.
Also downloaded
LGD950AT-01-V20b-310-410-MAR-22-2014+0.zip
LGD950_20131202_LGFLASHv160.dll
LGUnitedMobileDriver_S51MAN312AP22_ML_WHQL_Ver_3.1 2.3.exe
VC_RedistInstaller.exe (just in case)

I'm smart but my organizational skills suck.
Would some kind soul explain how to get stock KK on my Flex D950 & retain or gain Root.