"Painstaking attention" means being extremely careful, thorough, and taking great effort to do something correctly or pay close attention to detail. Full definition
This car is all about detail engineering, with painstaking attention paid in particular to the chassis, aerodynamics, weight reduction and structural rigidity. (evo.co.uk)
The result of painstaking attention to detail and quality shows in the finished prints. (americanabstractartists.org)
White is more of a technician in the net who relies on his length and wingspan to cover the net as well as painstaking attention to the details of goalkeeping technique. (sportstarsmag.com)