As long as they're used properly, you're clear from danger's way. I'm assuming you bought similar items to the ones in the pic:



If so, make sure they're holding down on opposite sides of the spring and as much of the spring as possible (similar to the pic). Make sure the clamps are secure and in place. Compress each side bit by bit and make sure the pressure is as close to even as possible.

Best routine is to undo the top nut that holds on the top hat (exterior to the strut tower), then undo the bolts that hold the strut onto the hub. Remove the strut, then compress the springs on the ground. Once they're compressed and no longer sitting on the bottom or top perches, remove all the other nuts and remove spring. Installing springs is exactly the reverse of removing them!