If you want to learn at first hand - or perhaps at first foot - all there is to know about crossing America entirely under your own steam, then you beat a path to Tom McGrath's door.
Tom is a world renowned super long distance runner and while his actual running days are now in the rear view mirror the Fermanagh man's knowledge is yet immeasurable, his advice indispensable.
And so it was to that front door, specifically the one fronting the Black Sheep Bar & Restaurant on Third Avenue in Manhattan, that Fergus Farrell made tracks for as the days ticked down to the start of his walk across America.
Farrell and McGrath huddled for the better part of two hours in the Black Sheep on Wednesday discussing everything that could arise during Farrell's upcoming walk from New York to Los Angeles.
Tom McGrath knows the way, or pretty close to it. He ran from New York to San Francisco in 1977.
Walking and running are essentially the same motion, Tom says.
And so his advice to Fergus, a good deal of it written on sheets of paper, the rest imparted verbally.
Suffice it to say there are more things to consider in a venture like this than the non-transcontinental walker/runner would ever come up with.
If ever there was a case for micro management and micro everything else this is it. And beyond the micro there is the macro - that walk, all 2800 miles of it.
Fergus, who is 47, is from Athenry in County Galway, and who played rugby for Connacht and Galwegians, is walking to raise awareness of spinal cord injury and funds for research. He is backed by the Christopher and Dana Reeve Foundation and Spinal Injuries Ireland.
And now, also, by Tom McGrath.
Fergus is scheduled to appear on ABC's Good Morning America Friday morning at 8.30 a.m. His walk into the vastness of America will start on Saturday morning on the Manhattan side of the Brooklyn Bridge between 8.30 and 9 .a.m. He will pay his respects at the Great Hunger Memorial on Manhattan's west side before taking a ferry over to New Jersey.
From there, Fergus will walk. And hopefully do so all the way to Los Angeles.
