Who said anything about the Doctors steerin'?
I'm talkin' abou the Tardis itself takin' the Doctors where they needed to be at that certain time.
Sorry, I was a bit ambiguous. I didn't mean to say the Doctor steered the Tardis there, rather that it would be impossible for the Tardis to be steered there, by anyone. Even itself.
We know from 'Name Of The Doctor' that the Tardis had faulty navigational circuits. So the First and Second Doctors' meanderings were not (just) lack of skill at flying the thing. The Tardis, in those days, was inherently unsteerable.