Who?It is best for the homeowner to affix the Mezuzah and say the blessings. When? The Mezuzah can be put up at any time of day or night, other than Shabbat or major Jewish holidays when work is prohibited. How?The Mezuzah should be permanently affixed to the doorpost. To do this, it is best to use nails or screws, but if necessary, you may also use glue or double-sided mounting tape. Regular scotch tape or masking tape, which are temporary adhesives, should not be used. The Blessing:When putting up Mezuzahs for more than one doorway in a house, only say the blessing once. When reciting the blessing, keep in mind the other doorways and the blessing will include all those Mezuzahs.Prior to affixing the first Mezuzah, the following should be recited:"בָּרוּך אַתָּה אַדָנָ-י אֶלוֹהֵ-ינוּ מֶלֶך הָעוֹלָם אַשֶר קְדִשָנוּ בְּמִצְווֹתָיו וְצִיווָנוּ לִקְבּוֹעַ מְזוּזָה""Baruch Ata A-do-nai Elo-heinu Melech Haolam asher kideshanu bemitzvotav vetzivanu likboa Mezuza."Translation: Blessed are You, L‑rd our G‑d, King of the universe, who has sanctified us with His commandments and commanded us to affix a Mezuzah. May god be with you and bless you and your family!