Before you go to the cherry picking farm, make sure that it is open. Call ahead to make sure that there are ripe cherries available and that you will have plenty of time to harvest.
When you get the farm, you will be assigned a tree and ladder. Move the ladder to a spot under the tree that does force you to stretch to reach the cherries. Do not climb on the tree as that can be very dangerous.
Unlike some fruit, cherries do not ripen off the tree so look for cherries that seem heavy, firm, have a shiny skin and have a fresh stem.
Pick the cherries from their stem. Twist the stems near the base and they should come off easily. Put the cherry into the bucket inside the fruit liner. The liner is key to keeping the fruit clean.
Once you get home from your cherry picking trip, put the unwashed cherries in the refrigerator. Refrigerated cherries can keep up to two weeks.