As Greyhawk says "opinions and results may vary," but I'd recommend you try
  to fly from an area with more "open space" around it, and a runway long
  enough to accelerate to TO speed and then stop on the runway if at all
  possible.

I second that wise recommendation. For a IVP first flight, a 5000 foot runway at sea level would be about the minimum I would recommend for risk management purposes. I flew mine out of Spirit (7000') and we did several high speed taxis up to rotation speed before the fuel flow, MAP and RPM were finally adjusted to the proper limits.

 

Jeff Edwards

LIVP N619SJ