1. One thing at a time
   - in small stages, piecemeal, step-by-step, stepwise

1. A little bit at a time
   - piecemeal, little by little, in stages 
2. In a gradual manner
   - gradually, step by step

See also: gradual

• city
• city block
• city boy
• coco plum
• coco plum tree
• cocoa
• cocoa bean
• cocoa butter
• cocoa palm
• cocoa plum
• cocoa powder
• cocoanut
• cocobolo
• coconspirator
• coconspire
• coconut
• coconut cake
• coconut cream
• coconut macaroon
• coconut meat
• coconut milk
• coconut oil
• coconut palm
• coconut tree
• coconut water