How to make fried fish avoid sticking the pan when cooking

I like fried fish very much.But it's very easy to made the fish skin sticking the pan when cooking them. How to avoid? Many people tell me many ways. But it seems that there is only one way works: pour some oil in the pan when the pan is dry, heat the oil to high temperture before you put the fish in . This is the most easy way to avoid the fish sticking the pan when cooking, you would get a beautiful fried fish with crisp skin.