hi amlav,
i too am looking at pulling my gearbox out shortly, i need to replace my release bearing and will also need to do the seals. Having pulled the gearbox out before you can do it with to trolley jacks but wouldnt advise. I know MM has pulled his out several times with a atv jack i think something like this
http://www.ebay.com.au/itm/like/1214...pid=107&chn=ps
i was talking to a friend who suggested one of these and plan on pulling mine out with it
http://www.ebay.com.au/itm/Transmiss...oAAOSw3xJVbQM~
i would leave it with the cross member still attached.
if you know how to line a clutch up by hand, go for it. However if not i would recommend getting the clutch alignment tool.
you dont need to but i would be prepared to replace the spigot. mine was non existent when i did my clutch, i just pulled it out with my little finger, no press / removal tool needed
upper bell housing bolts (there are two of the) are e-torx bolts, you will either need a special spanner or special e-torx sockets (some people get away with a multpoint). change those bolts over to hex ones once you have them out.
make sure you mark your drive shafts relative to your tc and diff. we didnt with mine, but probably should have
another optional is to regrease the flex plate and clutch plate springs. you need a specific grease for this.
if you choose to get the flywheel machined while its off. shop around. some places want to treat it as a commercial truck flywheel. its really not.
all in all with the right tools i think you should be able to do it by yourself. but hey get a friend around for some beers just to help out. even if its for the tricky bits.
i hope some of this is helpful. its a bit of a brain dump.