Good foregoing information. In addition, mentally prepare yourself that when you break ground, you'll allow the plane to accelerate in ground effect for as long as it is comfortable/practical. There after, clear the obstacles - by only enough to be safe. Allow your airspeed to build, at the expense of excess altitude if needed. If you are airborne, and suddenly worried that you might not clear the obstacle (like the trees at the end of the runway), aim 2/3 their height, and build the speed. Your good common sense to prevent your hitting them. What NOT to do is to climb needlessly high to clear them, and then jeopardizing your airspeed. Just clear the obstacles safely, that's all you need.
When airplane performance is just enough, there are more cases of climbing too much, and then stall spin back in, than hitting the trees because you did not climb enough. When I teach float flying, I'm anal about not aiming for a flight level over the trees at the end of the lake, just clear them with a bit of extra airspeed in your back pocket.