I am not a heli pilot); Just for my interest; how does one navigate in such confined spaces, near trees etc?...
What 'JimEli' said, above, additionally-
I would land as far forward as mandatory rotor clearance (10-15') would allow, and laterally centered. Often (but not always, and never without pilot checking) there is room to maneuver, reposition, turn, etc. I require a specific, visually obvious and fixed ground reference to base those maneuvers on.
I believe in a pilot ground recon whenever practical and possible, preferably engine off and rotors stopped. This isn't always a good choice, such as when one has landed on a main artery or single access, in which case one lands as far to the side as necessary to allow traffic movement.
As posted earlier, use a ground guide but with discretion- I've had occasions when the ground guide stopped guidance because of the belief that the pilot was better aware of hazards.