A press or a pillar drill certainly makes it easier for rear ones, but a slide hammer will do it eventually as well, plus drift, hammer etc.
There is nothing wrong with these bushes at all, think they are cold cured poly also, and this gives much better shear properties on poly.
Some honda engine/box mounts are being done/reinforeced with poly at the mo, and if they come out ok I am going to poly a rear diff mount, as sick of waiting for a certain other company to get thier arse in gear, will try myself, then give two foc samples for friends to try.
tabetha