Place the vehicle on ramps, or jack up the front and support it on jack stands. Follow all safety precautions. Note all wiring connections to the starter and solenoid. Remove any other wires attached to the solenoid if it is starter-mounted. Note the wire positions so you can replace them correctly.
Most bolts attach horizontally through the mounting flange.
On GM cars the bolts are vertical, and there may be a shim between the engine and starter block. If there is one, it must be used with the new starter. Remove any support bracket that holds the front of the starter. Drop the starter down. You may have to turn the wheels to one side or disconnect an idler arm on some Ford cars.