I just changed the front NS upper wishbone rear bush this morning, the one linked to in the first post of this thread.
I left the house at 9.30am and was back inside at 11am (the same day ;0) )
you need dies or sockets of the correct dimensions to knock out the sleeved bush, or a press, or a bolt and nut puller. I think a 6 inch flywheel puller would work too.
I used a repeated strike power press ( a 2lb hammer) to knock the old one out and the new one in. The downside of hammering a bush in is that you distort the edge of the sleeve slightly, so the last 1mm or 2mm is a bit tight.
I used the grinder (but a file would do) to make a shallow taper on the new sleeve to help it locate in the hole in the arm.
To get the two top bolts out use an E18 torx spanner. The bolt heads are flanged and the flange won't pass between turns of the suspension coil spring so yoiu need to open up the coil spring a little. I managed it with a long lever, you only need to open it a few mm so a tyre lever or crowpar would do.
To help with getting the bolt heads to line up with gaps in the coil spring I put a wooden block under the lower suspension arm and with the jack i raised and lowered the body to line up a gap between the spring's coils with the head of the top bolt.
The nut at the top of the hub carrier which holds it to the suspension arm is the usual ball joint splitter affair.
1 1/2 hrs all in, so it's not a major job. Just make sure you have suitably sized dies/sockets/drifts to drift out the old bush.
The front bush (also available from the same ebay seller) looks to be no more difficult, except the central boss is larger http://www.ebay.co.uk/itm/Wishbone-S...item484d59d34a
I think the same method should work but more care might need to be taken when pressing the new one in because of the risk of damaging the boss.
I think the best thing to do before ordering a bush is to split the ball joint first and check that the ball joint is in good condition and to find out exactly which bush is worn by heaving on the arm. If the ball joint is no good there's obviously no point to bush replacement.