How's an LDS blessing done, is this when they baptize their dead by dunking them into the font?
Priesthood ordinances are sacred acts given by the Lord and performed by the authority of the priesthood . Priesthood blessings are given by the authority of the priesthood for healing, comfort, and encouragement. Brethren who perform ordinances and blessings should prepare themselves by living according to gospel principles and striving to be guided by the Holy Spirit. They should perform each ordinance and blessing in a dignified manner and comply with the following requirements; the ordinance should be:
1. Performed in the name of Jesus Christ.
2. Performed by the authority of the priesthood .
3. Performed with any necessary procedures, such as using specified words or using consecrated oil.
4. Authorized by the designated priesthood leader who holds the proper keys, if necessary.
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Please go to this link if you want to read more. Priesthood Ordinances and Blessings