Speed learning a 50-page drivers' manual is among the challenges facing Brendon Hartley as he prepares for his Formula One debut in Texas on Monday morning.

The Kiwi's shock call up to the Toro Rosso team a few days ago will see the 27-year-old from Palmerston North fulfil his childhood dream, while re-igniting hopes of becoming a regular F1 driver.

Preparations have included practising in a simulator, although Hartley told Mike Hosking the benefits were limited.

"I'll start today in the simulator and fly to Austin tomorrow." 

"(simulators) are still pretty far away (from reality) and you don't have that same adrenaline rush through your veins. It can prepare you to a certain extent, it's better doing it than not doing it.

LISTEN ABOVE AS BRENDON HARTLEY SPEAKS WITH MIKE HOSKING