Vocal Isolation & Custom Fade Out

I need assistance isolating the vocals from an MP3 song and creating a fade out at the end of the guitar solo to make it fit for a walk down the isle.The final output should have the vocals completely isolated from the music.

Ideal Skills:
- Audio editing
- Vocal isolation
- Sound engineering

Please ensure you can work with MP3 format and have the necessary tools and skills to achieve a high-quality vocal isolation, this is for my wedding ceremony.