From Ground: Issue a gentle watering the day before to make the extraction easier. Then, using your trowel or small shovel, carefully, begin digging a circle around the base of the creeping buttercup, aiming to take as much of the root system as possible. Lever the creeping buttercup from beneath, gradually loosening the plant from the soil. Hold onto the base of the creeping buttercup while lifting it from the ground to ensure it comes up with a maximum amount of roots.
From Pot: If from a container, you might want to water it an hour before procedure. Gently tip the pot sideways, while your hand supports the creeping buttercup at the base. Then carefully slide the creeping buttercup out of its pot. Avoid pulling the plant as this can damage the stems and roots.
From Seedling Tray: Water the seedlings beforehand, this will bond the soil together, making the moving process smoother. Gently hold the base of the creeping buttercup and use a spoon or a small gardening tool to scoop the seedling out, making sure to include as much roots as possible.