If there the original ones you will need a press to push them out and a press to push them in.
Other way of getting them out is to use a hole saw to drill out the centre, The rubber part.
Then use a hacksaw to cut through the metal ring part of the bush, and use a cold chissel and a big hammer to remove the ring.
If replacing with nolathane bushes, you just push them in by hand.
If replacing with original rubber bushes, With the metal outside, you will need a press, or you might be able to use a strong vise.