i just started an anti-ncr character, how do you go about a character like this? do you just kill every ncr person their is? or do you slowly do it over time?

Just go in their camps and kill them all. Just wait until you level up a bit. I started doing this right at the start and the Ranger assassins were almost impossible to kill.

thats what i was thinking, plus theirs way more ncr around the Mojave then any other faction so to piss them off at a low level could almost be suicide!!

Actually it will be interesting if you sabotage them. Play a double agent style, doing little quests that grants reputation, then take their wealth.

Achieve liked reputation for the safehouse key, so you actually gain good armor for infiltration missions. Make Chief Harlon commit suicide, wich will weak the republic, because this way they will become even more corrupt; after this mission stealth kill the officers in Forlon Hope for Dead Sea and hear from Caesar how you turned Forlon Hope into a graveyard; don't kill all the Fiends leaders, so they are able to attack McCaran during the battle for Hoover Dam; make Boone bitter during his quest, so he commit suicide in the end (although he will kill an incompetent and lame officer, so i don't know if this is good ); "kill" Helios One, so no one can use it again; help Contreras stays as McCaran's quartermaster, wich is good for you, but bad for the NCR; and of course, blown the monorail.

After you decide wich faction you'll support, them you can attack their settelments.
My two cents, of course.

I prefer the less than sublte type of NCR resistance. I kill their people on the roads, mine the roads, my personal favourite touch is my boycott and eventually destruction of the Gun Runner's and Crimson Caravan.

"You could call the Gun Runners an un-official part of the NCR Army." - Alexander.

Way-to-go to sign your own death warrent pal. Basically I shut-down anything that could be construed to have a positive or beneficial affect on the NCR as a whole, regardless of whether it was intential or not.

OK, Crimson Caravan is easy, but how do you destroy the Gun Runners?

Mercy my friend!

Scoped Hunting Rifle with Armour Piercing Rounds and ED-E

The vendotron is invincible, the game will never really say they are shut down as he will just keep restocking, so it seems that the NCR has some new technology taht makes ghosts able to make weapons and restock inventories.

I thought the Vendortron could be killed by hitting it with the Golden Gloves.

That sounds quite amazing. Maybe my latest character would do that too.. After getting all exp and money from their quests though.

That's a bug.

I don't even do that. Anything that is beneficial to the NCR, willingly or unwillingly, will be removed. I will not put a single cap into the NCR economy.