About the satchel charge, that all depends on how much you trust both your ability to make the jump and the game's choice as to whether it admits you made the jump or not ^0^; I really prefer to get it from the ground. Also before I forget- about the jump to the Eagle Feather; Only jump from the flat surface at the top towards the metal beam. It always makes you fall through if you're leaning on the ramped surface. Also, I find the jump much easier if I first kill the patrolling Endtrail and use the Flare Gun at the top to get a cleaner view of the top surface of the metal beam. Also when you make the jump and get the easy feather and switch, it's definitely better to get the charge from the ground because the spawn trigger for one of the wall patrolling Endtrails is right on the other side of the big circular support.
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