The inner brackets are quite awkward to reach to for a start, but more to the point, the amount you have to compress the bushes to even begin to line up the bolt with the holes on the brackets. You have to take off both triangular plates underneath to get the ARB off, and what I ended up doing was bolting the bolts for these back into their holes, bracing a small flat piece of metal against them and using a G-clamp to try and clamp the ARB back up. After that I still used longer bolts. Again, had to use the G-clamp on the wishbone ends.
Get yourself a G-clamp anyway, no way in hell will you get it back lined up with just hand power.