If you've already installed busybox and safestrap 3.75
1.(open. Safestrap and hit "install recovery" then it should say "installed).
2.then go ahead and download a KK rom (make sure it's KK not JB) then put the file on your external SD card (if you have one).
3.Reboot your phone. Then the phone reboots, after the "galaxy note 3" screen there should be a splash screen with a little creepy looking creature in it and on the bottom corners of your screen you'd see "continue" on the right bottom and "recovery" on the left bottom. Click on the "recovery" one then it'll take you to safestrap recovery.
4.From there you can back up your current rom by clicking on "back up". That will take you to another page where you can swipe the bottom to start backing up. Make sure to check "enable compression" on that screen. Let it finish (it'll take a long while to finish. Don't panic. Just let it finish no matter how long it takes. For me it takes at least 20 minutes.lol).
5.After that go back using the "back" button on the bottom right until you get the home screen. Click on "wipe" then swipe the bar in the bottom to factory reset your phone.
6.After that click on "advance" and check everything but "micro SD card". You don't wanna delete that. Swipe the bar in the bottom.. now your phone is clean.
7.Back up to the home screen again. You'll see "install" click it and find your KK rom that you downloaded. Click it then swipe the bar on the bottom and let it install. Once It's done flashing. Click "reboot" on the bottom right of your screen then your phone will boot up to your new rom. Let it sit for at least 5 minutes then set up your phone.
I'm personally using "dynamic kat" rom and I love it. If you'd like to try this rom here is the link to the thread http://forum.xda-developers.com/show....php?t=2709701 very friendly group of people and they'll help you with everything they can to get you running.
Keep this post in front of you on your computer and work on your phone following the instructions in it to help you out because I'm going to sleep. It's too late now and my wife is getting mad.