Ideally, you would want the car on a set of axle stands for safety and to get the car high enough. Place these under the sill on the chassis member, just forward of the jacking point.
Simply undo both nuts from the wishbones but DO NOT take out the bolt as your suspension may collapse. Just in case dont do it!
Simply slide the brace over the bolts making sure the brace is the correct way round and place the nuts back onto the bolt. With the OMP one, the nut sits inside the brace and its sometimes hard to get the nut on. So you can knock the bolt back abit but be really careful not to hit it too far.
Then simply tighten everything back up with the correct spanners and sockets.
You could do with a friend helping you too.
Hope this helps.