Get a long bolt, or threaded rod, that is long enough to reach all the way through the swingarm. Use a stout washer or several washers on the small end of the bushing. Place another washer on the other end of the swingarm that is larger than the bushing, followed by a nut. Slowly tighten the nut and it will draw out the bush. Flip the whole thing to the other side, and draw out the second bush. You might have to experiment around with the small washer size to get a good fit on the small bush, and the rod and nut need to be up to the job, but this works quite well for me. On assembly, place the new bushes in the freezer overnight, and they should go in without too much force. I've replaced many this way, and have never had to press any in or out. But, of course there might be an exception.