The phrase "act personally" is correct and usable in written English.
It can be used when referring to someone taking direct action or involvement in a situation rather than delegating it to others.
Example: "In this matter, I believe it is best for me to act personally to ensure everything is handled properly."
Alternatives: "take personal action" or "get involved directly".
The governor is even getting into the act personally.
"Tom is a class act personally and professionally".
He called on Boris Johnson to intervene and "act personally to protect athletes, visitors and Londoners if the government continues to fail to do so".
"The prime minister has previously demonstrated his commitment to Gibraltar and its people, and it was entirely in character for him to want to act personally following the latest escalation by Spain," said the Gibraltar government.
The speech also contained longer passages on foreign policy and human rights than in Ed Miliband's speeches, and challenged Cameron to act personally over Ali Mohammed al-Nimr, a protester who faces the death penalty in Saudi Arabia for a crime he allegedly committed aged 17.
Even President Obama has gotten in on the act, personally pitching DJ and others.
The person acts personally attacked whenever you discuss things that he or she isn't keen to open up about.
I would have gone with the Alien and Sedition Acts, personally [pause for laughter].
80 Overall, these physicians were more willing to refer patients to a colleague for voluntary euthanasia (44%) and assisted suicide (41%) than to carry out such acts personally.
The act itself — personally, morally, legally and culturally — is practically unimaginable in most of the world.
Colleen Werthmann, a Civilians veteran, is memorable as the feisty Patti Hagan, half of a politically engaged sister act who personally went door to door to conduct an informal census proving that more than 800 people lived within the "footprint" of the planned development, not the 100 Mr. Ratner had blithely estimated.
