Take off from high altitude airport with heavies

[olseric]

What you need to do is learn the procedures for a short field take off and short field landing.

Without going into too much detail, a short field takeoff entails using ground effect to get you off the runway quickly...then start retracting
everything while clipping treetops (straight & level) until you have built enough speed to slowly climb.

Short field landing involves touching down on the numbers basically at stall speed and then jamming on everything to stop the plane.