Did mine on the drive, pretty easy. Hardest part is trying to adjust the drop links so there is no preload on the ARBs, which should be done with the car on the ground, so there isn't a lot of room to work. You need to do this so that when the car is in it's normal position, the drop links easily slide in the hole on the ARB. (Attach and tighten one side first, drop car and settle suspension, then adjust opposite side to easily slide in) Exhaust needs to be detached at the mid pipe and hanger unbolted which will be difficult if yours is in poor condition, mine is only 6 months old so bolts were fine. I've read some people are able to remove the ARB without unbolting the exhaust somehow.
It will be fine if you have the correct tools eg axle stands, breaker bar, 6 point sockets, plus gas releasing spray/WD40 if you can't get any, wire brush and a blow torch may be necessary.