Not just for the tree's sake, but yours too.
I've just been reading a harrowing account of a man who climbed a ladder to remove a branch, fell, and broke his hip.
The ensuing surgery, pain, months of rehab and total disruption of his (and his family's) life was very sobering.
And all to remove ONE SMALL BRANCH!
I remember reading somewhere that hospital emergency departments see more ladder accidents than anything else.
Stay off 'em I reckon.