Replacing struts is a straightforward DIY especially since you have spring compressor. I would not replace the springs. It is extremely unlikely they will ever break. I suggest checking the rest of the front suspension for wear at the same time. Once you are done you will need to have it aligned.

I don't know what you are pricing that is $400 so have no input.

What year and model do you have?

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas