How to cut curved legs for a table
User is right saying you should cut the rough shape with a band saw.  If you don't have one, you can use a jig saw but use the most rigid blade that will follow the form.  The next step will be to use a table mounted rotary sander/ drum sander to work the piece to the scribed line. It will be next to impossible to make a well shaped piece without this step.  Check out a few episodes of "New Yankee Workshop" online (PBS) to see the techniques.  Keeping a full length of grain top to bottom is extremely important,(as mentioned) otherwise the piece will split in time. Good luck with your project.