To aim a leaning tree, follow these steps:
1. Remove soil from exposed roots and gently straighten the tree.
2. Ensure all roots are below ground level.
3. Support the tree with a stake, pounded into the ground at an angle opposite to the lean.
4. Replant the roots below grade level and pack soil around them.
5. Monitor the tree's progress and adjust as needed.
Aim to straighten the tree and provide necessary support for healthy growth.