bit of advice mate, there a bit of a bastard to do, as the breather hoses and the 3 other smaller breathers are routed through a small hole in the chassis rail, its not the easiest thing to do, i had troubles and i done it on a hoist with the tank on a gearbox jack..
the 2 metal straps that hold the tank in are easy.. its the hoses that are the problem.. id recomend goin to holden and getting the 3 new small breather hoses and the larger breather and taking it to a workshop and get it done properly...
it would be an absolute bastard to do on the ground.. i wouldnt atempt it without a decent amount of knowlege..
pain in the arse raiting out of 10, 9....
good luck if you try it lol