Good job. Any time you can pull/push two items on the same car it is safer than trying to pull/push between that car and something else. By any chance did you try moving the lower arm around when the guide mount was off? IF you did it might tell you if you need new bushings on the lower arm. I did all my suspention work with out having to replace those. From what I can tell the only time you need a spring compressor is for the lower arm. Try checking, I think, in the DIY section because there are people willing to rent out the correct compressor and you only want to use the one made for these cars.

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1983 300SD
200000miles