Can't do it for state crimes and has to be charged first
How do you pardon yourself or other folks who have not been charged with anything by the federal government. Does that mean you could commit future crimes and could not be prosecuted? This makes no sense at all. Pardons are for people who have been convicted of a crime or crimes.
I generally badly dislike 'witch hunts'(tm).
But since tRump has apparently been taking steps to hide his and his minions and his enablers acts -- such as deliberately violating the Presidential Records Act I'm afraid that a lot of the evil of this group will only be revealed through somewhat unrestricted investigations.