I think its like the 124 arms. I was able to it without taking the arm off the car. I jacked up the car, removed the wheel, then lowered the arm onto a stable block. This will prevent the spring from shooting out and ruining your day. I also used an appropriately shaped piece of plywood as a shield in front of the spring if something unforeseen were to happen and if the spring were to come out it would stay safely behind the plywood.

I made a puller/pusher from M24 threaded bar and nuts and some hefty pieces of steel. If you dont have access to a lathe or welder then you may have to buy or rent an appropriate puller.

There is a bit of a grunt in fitting the strut botttom over the new ball joint, I loosened the strut top mount to help me with this.

Safety should be your primary concern in this job, but with a bit of planning it is relatively straight forward.