Most garages have a hydraulic press which is normally used for pushing bearings in and out of hubs, but it'll push a rubber bush in though if you use a socket to press against the metal edge of the bush.
If you get both wishbones off, drill and cut the old bushes out, take them to a garage and ask if they'll take a tenner for pushing in the new ones, if they've got the press it'll take iinutes once set up.
If you get both wishbones off, drill and cut the old bushes out, take them to a garage and ask if they'll take a tenner for pushing in the new ones, if they've got the press it'll take iinutes once set up.