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

• pyrochemistry
• pyroclastic
• pyroelectric
• pyroelectrical
• pyroelectricity
• pyrogallic
• pyrogallic acid
• pyrogallol
• pyrogen
• pyrogenetic
• pyrogenic
• pyrogenous
• pyrograph
• pyrographer
• pyrographic
• pyrography
• pyrokinetic
• pyrola
• Pyrola americana
• Pyrola elliptica
• Pyrola minor
• Pyrola rotundifolia
• Pyrola rotundifolia americana
• Pyrola uniflora
• Pyrolaceae