How to pass the game with such horror? (The Witcher 3: Wild Hunt)

And again I appeal to you. To those who already know a little more about the game this. And so: how can I play the Witcher 3? From the beginning I set the difficulty level death, killed the Griffin, and after it became a tin.. I disconnected the complexity and crossed the unusual. Why? Yes, because in addition to the main story branch of kV, I would like to do and side quests.But I can't... because they are 5-10 LVL more my level. If the lightest you can manage it, death is a direct death... it is impossible. Here in what a question: to go through the whole ridiculous, and then to do side quests. Or... don't know what... think differently in any way. I ate how I did level 10 kV to 23. And saved me only gourmand and Aksi. And when enemies not 3, but 5 or more, you have nothing to save.