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heyy mate, i did this on my neighbours vt like a week ago, its pretty straight forward if u have some mechanical know how.. got a new barrel for 38.80 trade from holden and a switch cause it was flogged out, all you need to do is take the plastic cover off the steering colum, one screw, and put the key in the ignition turn it to 'on' or 'accessories' position, and on the top of the barrel there is a little hole, just push it with a 3mm allen key, or something little, i used an 'o' ring pick, a bent spike, and pull the key out and the whole barrel will come out,
then to re'code the new one, it fairly easy, i looked at the bits n pieces that came with it, n was thinking holy sh**, but its not that bad, there is a little spring loaded pin on the back of the barrel, (you cant see the spring but) where it goes into the ignition switch, u need to push it in then turn the key in the barrel, kinda hard to explain, then slide the inner barrel out, but leave the key in it, otherwise the tumblers will fall out n ur in ****, then once thats out, i just used sticky tape to hole the tumblers in place, 5 on each side, then pull the key out gently, and read the numbers on the brass slides/tumblers, 1-10 i wrote them down on paper so i didnt muck it up, and put the new springs in with the slides, with PLENTY of dry lube, squeese em in with ur fingers and slide the key back in, then ul need to put two other bits in the outter barrel case, just look at the old one to see how, slide it back into the outer case and push the pin in with the spring behind it,all the way in, and turn the inner a bit to click it around,
mmm kinda vauge instructions but if u get stuck just msg me n ill help u out as much as i can, i wouldnt pay any1 to do it, its pretty easy and saves you some dosh...:thumbsup: