It is rightly said that the most difficult thing in chess is winning a won position
In games against humans, you often win because the opponent blunders a piece, and you can often survive when you do it yourself. Against the computer, you make only one mistake - the last one.
So basically it's very simple: to start with, if you want to win the match, you shouldn't be afraid of him. There are still many, many things to do, but above all this is the most important: Don't be scared of him!