Hallel
Full Hallel is recited each day of Chanukah, right after The Amidah of Shacharit. If the Chazzan is a mourner (for a deceased parent) during the first eleven months, someone else takes over for Hallel, but not for the Kaddish which follows.
One must recite Hallel whilst standing unsupported. If this is not possible, or after the fact, the Mitzvah is fulfilled even if sitting.
One may not interrupt full Hallel other than for those things that one may respond to during the Brachot of Kriat Shema. [E.g. If the Chazzan recites Kaddish, one answers Amen Yehei Shmei etc, and Amen to d’amiran b’alma. One also answers Barchu and Amen when the Brachot are recited before and after an Aliyah, and may also recite the Brachot if he is called up for an Aliyah.]
It is preferable to recite Hallel with the Minyan. If one is not up to the Minyan, this creates a dilemma; on the one hand it is appropriate to recite Hallel with the congregation, and on the other hand, it is appropriate that one should daven in the correct order. One should therefore make a point of being up to the Minyan when Hallel is said.
If one forgot to recite Hallel, he should recite it with a Brachah as soon as he remembers, unless the sun already set.
If one mistakenly recited half-Hallel, he must repeat the entire Hallel (without a Brachah).
After Hallel, the Chazzan recites only half Kaddish. [If he mistakenly said Kaddish Titkabel, he should recite half Kaddish after U’va L’tziyon.]
