Tory election supremo Sir Lynton Crosby has been drafted in by Theresa May
Ministers feel the Conservatives will be judged by the size of the majority they secure on June 8 and know they cannot be "complacent".
One minister told the Daily Telegraph: ”People are waiting for us to trip up.
”Appointing Sir Lynton shows how serious we are. This campaign will be run with military precision, there will be early mornings and late nights."
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Theresa May returns to Downing Street after a round of TV and radio interviews
Appointing Sir Lynton shows how serious we are
The Conservatives refused to say if Mrs May consulted 60-year-old Sir Lynton before she announced her decision to call a snap election.
But sources said she had "run the numbers" and carefully analysed the party's internal polling, which is likely to have been carried out by Mr Crosby's organisation.
Sir Lynton, known as the Wizard of Oz, will help run the Tory campaign from the Conservative Campaign Headquarters in central London.
Sir Lynton Crosby masterminded David Cameron's 2015 election win
He and business partner Mark Textor will work alongside Sir Patrick McLoughlin, the Conservative Party chairman, and Lord Gilbert, who was Mr Cameron's head of campaigning.
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Sir Lynton's team is likely to adopt the same rigorous approach they used in the last election with each day starting with a 5.45am briefing with a handful of key strategists.
He is likely to run detailed polls in marginal seats with focus groups of key voters, to ensure that every election message has been rigorously road-tested before it went public.
David Cameron pulled off a surprise election win in 2015 with Sir Lynton Crosby at the helm Politicians react to Theresa May's snap general election Wed, April 19, 2017
UK Prime Minister Theresa May has announced her intention to hold an early general election on June 8
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Theresa May has called for a snap general election
The Australian strategist was the architect of the Conservative's hugely successful strategy in 2015 to target Liberal Democrat seats in the South West.
His polling also helped identify voters' fears about the prospect of a Labour coalition with the SNP at an early stage, which proved pivotal in the campaign. Sir Lynton did not take part in the EU referendum despite approaches by senior figures from both the Remain and Leave campaign.
He correctly predicted the outcome of the last general election while most of the public polling companies believed it would be a dead-heat.