it comes with time, expereince and practice, my grand ma taught me how to knit as well, so my advice to you would be go find an old lady to help you out. but you have to start form the top, if you start from the bottom it turns out wrong.
yo i wouldnt start from the bottom.. but thats just me. i start out with a small donut of 4 stiches, the just do a dd, ds, dss,dsss,dssss,dsssss,dsssssss,dsssssss,dd,ds, etc. until i get the pancake the size of my palm, then i go ss the whole way down.
it works well.. and i use double yarn too. its sick