On lining up, check DI heading agrees with runway heading (1/2 second), quick full and free check of the yoke/stick (2-3 secs), check runway is clear (1/4 second) and then go.
Less than 5 seconds to sanity check three items that have killed pilots, whilst there is still time to stop the flight.
When rolling, monitor T&P, airspeed indication, acceleration and be prepared to stop, if unhappy with any.