if you have any mechanical sense ( i assume you do) its not hard, just can be a bit of a b**ch to get right... mines low, god knows how low, but after Ktec did it first time I got on the ramps in thick fit, but not for sh*t would it come off.... had to have 4 blokes lift the ass up in the end. i raised the back up a little but its still lowish. perfection will have the rear sitting slightly higher than the front.
Remember your valvers lower than a standard clio anyway!