The hand de-seeder works well but it makes a mess. Wear a cook's apron and gloves. Put the cherry in position and then place it in a large bowl in a sink and cover the punch with your spare hand while you punch the stone out of the cherry. This will stop cherry juice splashing everywhere.
I've put some cherries in the oven to dry. This is a learning curve and an expensive way of preserving them. Next time I use the oven I will dry the cherries at the same time as cooking a meal but this isn't always convenient. What I am doing now is learning things to put into good use next year.