The way I did it, using silicone grease, was to slide the bushing on the bar. Then I used two pairs of large Channellock pliers with pieces of rubber inner tube zip-tied over the jaws to keep from chewing up the bushings. After lubing up the brackets, I forced the bushings in by applying pressure with the pliers on both sides of the bushing at the same time. Having a helper with strong hands to work one set of pliers would have been a good idea, but not absolutely necessary. Maybe use one set of Vise Grips first and then Channellocks on the other side. Probably the best hint I have is don't be in a hurry or pissed off about something, because if you're like me you could end up throwing around f-bombs or tools (or both).
