To help prevent knots appearing in the thread as you are stitching, let the needle dangle down (whilst still threaded). The needle will spin and untangle, pick up the needle and continue stitching. The amount of times you have to do this will vary from person to person, you will soon learn to judge when to do this by looking at the threads themselves. If knots do occur see the previous blog on how to remove them.
I have been designing Cross Stitch charts for about 10 years now and have contributed to magazines such as Cross Stitcher and The World of Publishing. I have also written books for David & Charles. I love all things crafty my most recent books are '3D Rubber Stamping' and '100 Cross Stitch Cards' which combines Cross Stitch with other Paper Craft techniques.