How much would it cost changing your car from automatic to manual do you need to change the engine?

no but you need to install a pilot bearing in the back of the crankshaft to accept the spline for the tranny

It would be a lot more than just installing a bearing in the crankshaft!

You could end up by having to change the engine, you need gear lever connections, you might even have to have a new ECU, cost hundreds.

You can contact your local wrecking yards and try to locate the same vehicle you have only in a standard shift. The vehicle may be damaged from an accident but you would have all the parts needed to change over, every nut and bolt.