Done it on an SLK 230 Komp.
Not too bad a job so long as you can get the front reasonably high off the ground!
Wheels off, disconect steering arms from hubs, split the swivell joint from the pitman arm, unbolt the idler arm, slide the whole assy out through wheel arch, split off the idler and fit it to the new drag link.
Make sure you leave yourself enough room at the side to slide everything out.
Re-assembly is the reverse order. Don't forget to get the tracking checked. Even with careful measuring of the steering arm lengths, the tracking was way off!