There's more to it than just removing the old ball joint and replacing with a new one. In addition, if the top ball joints are bad, more than likely, the lower ones also need replacing. It's admirable that you're willing to do this repair in your driveway especially in the cold snowy weather. It'll take you several hours.. provided that you have the proper tools, to replace the ball joint. Best advice I can give you is to get a Haynes Repair Manual and read the procedure and list the special tools you'll need.
I don't want to discourage you, but you need to be aware of the task you're about to undertake. Good luck.