The phrase "a trusted hand" is correct and usable in written English.
It can be used to refer to someone who is reliable and capable, often in the context of providing assistance or guidance.
Example: "In times of crisis, it's essential to have a trusted hand to help navigate the challenges ahead."
Alternatives: "a reliable source" or "a dependable guide."
He has been the associate publisher of Twelve and a trusted hand at the imprint.
Europeans "see him as a trusted hand, knowledgeable," said Philip Gordon, a senior fellow at the Brookings Institution who has advised Democratic candidate Barack Obama on foreign policy.
Amid a scathing risk management review by the Federal Reserve, Mr. Pandit installed Brian R. Leach, a trusted hand, as the bank's chief risk officer and overhauled the organizational chart.
It is fun to be part of this film [Planes] as an old trusted hand who will help protect our hero, our naval aviators are some of the best pilots In the world.
After betting the house on film-makers such as Whedon and Black, Feige turned to TV's Alan Taylor, a tried and trusted hand on Game of Thrones, as Jenkins' replacement on Thor: The Dark World.
Meyer S. Frucher, the trusted hand Gov. David A. Paterson persuaded last year to develop a plan to save OTB, spent hundreds of thousands of dollars on consultants.
I escaped a complete tear-down of the motor only through an operation that involved the use of a stethoscope, another pair of trusted hands and the sort of concentration we associate with a bomb squad.
All of the line cooks, servers, runners and sous chefs on a busy Saturday night: it's these trusted hands that have to recreate your vision and perform it to a waiting crowd.
Beijing is also trying to pull off a delicate balancing act: imposing the disciplines of the market on management while keeping policy control of its national and local champions firmly in trusted hands.
The generous gift in that moment of trust is the patience to let the work unfold as it needs to in trusted hands.
Back to culinary pleasures -- I was left at the trusted hands of Chef Martin Berasategui (guest chef of the day) in Manhattan's Bar Basque.
