A scissor jack is the standard renault jack mate!!
You really dont need to count the splines!! Its as easy as i said!
Just measure the gap from centre of hub to the ground, mine originally was 115mm so i jacked it up to 140mm knocked both torsion bars back in half way and lowered the jack under the hub and remeasured just to make sure it was ok then banged the torsion bars home!
As jay said they only go in one way so you wont have any probs!
Is piece of piss, i could do it again in an hour or less and may as i wanna slam it some more but it scrubs already with a -25mm drop at the back! I am running 17s thou!