Holy smokes!
Removing those old bushings can be a stinker...literally. I've got a favorite method that doesn't 'tick' off the wife and is probably faster. I would first and foremost stress the issue of safety here, and proper eye protection ought to be first on everyone's list. Having said that...
This really works best if you have a drill press. Barring that, be very, very careful not to nick the inside of the sleeve while doing this. But, I've used a smallish diameter drill bit and quite carefully 'swiss-cheesed' the old rubber bushing sufficiently with an electric drill to then use a pair of needle-nose pliers and simply pull it out in a few easy to manage shreds. Be careful not to get into any metal by marking or taping a depth gauge on the drill bit first.
As I say, caution is necessary not to nick the inside of the sleeve. At the least anyhow, 'dressing' the inside of the sleeve down to a fine polish with your preferred flavor of grit probably isn't going to hurt when you are done.
Others may say not to do it this way, but it may make the process less of a chore and be quicker, too.