step by step
[ ˌstɛp bʌɪ ˈstɛp ]
• so as to progress gradually and carefully from one stage to the next.
• "I'll explain it to you step by step"
Similar:
one step at a time,
bit by bit,
gradually,
in stages,
by degrees,
slowly,
steadily,
slowly but surely,
gradatim,
