Remove the three top strut nuts on each strut.
Slacken the adjuster locking nuts on the brace. Plonk the brace on.
Hand tighten the strut top nuts, adjust the slack in the brace OUTWARDS. Not in, like everybody seems to do. Just take up the slack, don't force them out.
Then tighten the nuts. I think they're to be tightened around 18nm-20nm. Can't remember off the top of my head. Whatever you do, don't over tighten them. Them studs snap easily and if you snap one it's a strut off job.