Lower front arms are pretty easy but id advise that you do both together if poss,and def change the drop links and 100% put poly bushes on the rear control arm of the wishbones
Yeah ive had a remap done by Evolve Automotive,cost me £300 and was well worth the money IMO,but id get any other mods done first ie exhaust,air intake etc then do the remap last to get maximum result :)