need help unscrewing ~600 screws from deck

Garland Rd near Buckner Blvd, Dallas TX

Description

I need to disassemble the deck in the back so I can rebuild it better before selling my house. I'm going to use the same lumber. It was built very poorly with a lot of money-saving shortcuts. There are about 600 screws that I need you to unsrew so I can disassemble the deck. The screws will be kept and reused if still good. Please let me know if you can do this in a day and how much you would charge me.