Without knowing firsthand what it's like under there if you are concerned about that spring flying, find a decent sized chain and padlock try to secure the coil to the suspension.

A flying coil will ruin your day and probably take out a limb in the process.

You can try lowering the arm and hope it decompresses enough, but if it doesn't you will need the right spring compressor to put it back all together anyhow- so, make one attempt if it doesn't work bite the bullet and buy the compressor.

rjp

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03 540I (GAK!!)
81 280E (W123)
70 LeMans Sport with pissed off Poncho 462"
1989 Silverado Step Side (under the knife- complete restomod)