Switch audio in my video

I have a video of myself speaking that has bad audio. I have a separate, good-quality audio file. I need you to remove the bad audio that's in the video now and replace it with the good audio track, syncing it so it coordinates with my mouth speaking the words. The video is less than a minute and a half long.

If you can have it to me within two hours, I'll pay you double whatever you ask, as a tip.