Need to make a DVD for a party - Whats the best way?

Hi people - I sounds pretty easy… But I’m trying to compile a DVD with new music over the top to play on my projector for a party. I’ve used dvd decryptor and have all the files on my PC. Whats the best way to remove the original sound track, add new music and burn back to DVD?

I was hoping to just swap out some audio files and reburn?