I actually did do a DIY spring swap on to my new struts with a "cheap" spring compressor from Harbor Freight. I did buy two sets, for a total of four spring compressors. Instead of using just two, I used three total spring compressors and ensured they were fixed properly with the guide pins locked in. Three points of support are inherently more stable than two or even four. I also compressed them with hand tools, as recommended in the instructions, and went around to compress each of the 3 little by little. I not only paid attention to the screw rotations, but to how much force each one was taking to spin so they would all be loaded up equally.

Still cheaper and more convenient than taking it in somewhere. And combining the extra safety factor of using an additional spring compressor, along with keeping the ends of the spring oriented perpendicular to my body at all times, I felt pretty good about it!