I did this last year. You just line up the bushings so that the little rubber "ears" will pop into the holes in the outer column, then push then in. The only trick is to get the "ears" to compress and fit into the column opening, otherwise they may get sheared off. I really had no problem with it. Also, one bushing goes in from one side and the other bushing from the other end. That minimizes the length of travel that each bushing has to go before popping into place. You will need to lube the bushings, too, to make them slide easier.
I'll also note that I did what a lot of other folks do: I did not remove the old bushings. I just cut the "ears" and pushed them further in toward the center of the outer column and then fitted the new ones. This lends a little extra support to the inner column.
Good luck with it!