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Mishna Berura Summaries

Be careful to daaven the first tefilla of Chanuka, Purim, Yom Tov, or Yaale V’yovo on Rosh Chodesh from a siddur. Otherwise you will not be able to say the new tefilla fluently. (MB1)
Do not say Kiddush Levana by heart without reviewing it first. (MB2)
Tefillos and piyuttim that are difficult to understand must be reviewed for their meaning before daavening. (MB3)