Replacing injectors

I got a buddy that says he has a bad injector and wants to replace all of them. He asked if I was interested in doing them. I have done plenty of 6.0's and 7.3's but never and Duramaxs. Is there anything special needed or tricks to doing them! Im not a rookie to a wrench by no means just to a Duramax. Any info would be much appreciated!

make sure and replace the sleeves and all the washers on the return lines, you might be all right going back with the washers but better safe than sorry, i have saw them leak. Theres a special tool to pull the sleeves out but we just made one

On 2nd thought what year is it? the 04.5's up are much easier to change...

Merchant Automotive sells a complete install kit with everything needed, plus has the best price on the actual injector (newre chrome ball and seat) if you don't have a good source for them

Thanks for the info! Its a 02 by the way.