It's not easy if you've never done anything like this before. First you have to have a video capture device to import the video to your computer. Once the video is on your computer, you will need a video editing program such as Premier or Final Cut to edit the frames in which you want the subtitles changed. There are usually 30 frames per second in standard video and you will have to manually edit every frame you want changed. There are easier alternatives, but they cost a great deal of money.
It is not all that hard, but it will be extremely time consuming and even more so if you've never edited video before.
Good luck!
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\"The object of war is not to die for your country but to make the other bastard die for his.\"<br />-General George Patton (1885-1945)<br />  <br />Member of CLAN HADB<br />Founder of The Anti Clan Coalition
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