I don't think people find it easy to be on jury but if picked then its something you do as a citizen/part of your community. There's 11 others so its not just on you.
You don't have to say a person is guilty! You make up your own mind if someone is guilty or not. They could be NOT guilty.
The judge is the one that makes the final decision, you are just helping them by considering the evidence (or circumstances) it is not decided until the jury is consulted...at least that is how the justice system is MEANT to work.
Why do we have juries. Well didn't Jesus have 12? They were meant to pray for him too, but they all deserted him.