Related Clues:

• Gets one's feet wet
• Parallel parks, perhaps
• Enters sneakily
• Adds at the last minute
• Enters cautiously
• Starts something slowly
• Enters with care
• Enters gingerly
• Takes it one step at a time
• Enters warily
• Introduces gently
• Enters with caution
• Enters a hot tub, say
• Acclimates gently