DIY on removing Mercedes Front Drivers seat, this job is rather simple and is the same for all W210's and many other models. Ensure that you do not disconnect the battery however until after you have taken the four bolts off holding the seat down. You don't want your car to be without electricity and the seat positioned above the bolts. Its often required to remove a seat if a seat motor needs replacing, gearbox or control module has gone bad. 
Remember that the seat is decently heavy as well, and it's best practice to have an extra pair of hands helping to pick up the seat once it's disconnected.