Embodiments of the present disclosure include portable milling tools and methods for milling components. In an embodiment, a portable milling tool can be provided for a component including a plurality of dovetail slots therein, each of the plurality of dovetail slots being oriented substantially axially relative to a rotation axis of the component. The portable milling tool can include: a mounting plate configured to engage the component; a tool-aligning member slidably coupled to the mounting plate and extending along a chordal axis relative to the rotation axis of the component; and a milling head extending axially from the tool-aligning member to a selected one of the plurality of dovetail slots, such that sliding movement of the tool-aligning member relative to the mounting plate moves the milling head along the chordal axis to contact a selected one of the plurality of dovetail slots.