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One of my Mustang club members did it. He was blessed to have a friend do the switch and sold the auto for the cost of the manual. Unless you are like him, it will be very costly.
Please don't do it. Waste of $$$ and then some. If you really need a manual then trade-in. And automatic with a tune installed will do wonders. Other than that you'll need to just trade it in.
If you have the connections you could swap out to a t-56 or something....6-speed FTW! but, like others have said it will be costly unless you have the connections, and alot of work is involved.