Historical clue formulations

• Unacquainted with — 2023-12-31
• Unfamiliar with — 2020-04-01
• Unfamiliar with — 2019-08-11
• Still learning the ropes of — 2017-05-19
• Just beginning — 2014-04-26
• Just learning about — 2009-07-08
• Not familiar with — 2007-12-30
• Hardly an old pro at — 2007-03-03
• Unfamiliar with — 2006-03-21
• Unfamiliar with — 2002-05-31
• Not yet familiar with — 1999-09-12