I was surprised at how easy it was to make low-cost fresh mozzarella cheese in only 30mins and without the dreaded microwave oven. As long as you follow the directions closely your cheese should turn out wonderfully. I learned how to do this at the local farmers market with the guidance of Debra from Cheeses Loves You who teach cheese making.
The basic principal is to gradually heat the milk until it is warm, and then add rennet which helps the milk to separate or curdle. The curd is the milk solids and the whey is the watery yellowish liquid, which is by the way nutritious and too good to throw out. Mozzarella is formed from heating the curd, stretching and making a ball with your hands. The remaining whey can be added to soups, curries, dough, or anything that requires a slightly salted liquid. Apparently animals like dogs and chickens and pigs will gobble it up too.