The other guys are correct rent a spring compressor from Performance products or somewhere else. You need one that is for mercedes coil springs. The spring is a smaller diameter coil and the coils are closer together than american coils. Plus the coils dont ride in a true vertical alignment but at somewhat of a bow.

I tried a typical strut and coil spring compressors but gave up. Once I rented the proper compressor the job went much easier and safer.

Also while you there you might as well rebuild your lower control arm bushings and replace the upper control arms and bushings as well. And also replace the lower ball joint since you will have the wheel assemblies off.

Good luck.