Now you have your own little pile of butter and won't continually fish from the communal butter dish. Tear a bite-size piece off of your bread. Butter that bite-sized piece from your own little butter pile. Eat it with delight. When the next part of the meal comes, use the next outermost fork, and so on.
Same deal goes for the spoons and knives.
If you're in a fancy restaurant or a party at Buckingham Palace, you might be lucky enough to have waiters who will remove any utensils you won't need. You won't use a knife to eat your soup. You won't use a spoon to eat your salad. But let's say that you lose track of your utensils and get lost. Don't draw attention to yourself.