As long as you haven't damaged them I'd leave them well alone. There's no need to remove them to fit coilovers unless you're changing arms etc.
This is how I do it, it's also quite a bit quicker if you've got basic mechanical skills and the right tools.
1) Jack up and support the car from the sill, subframe or both and remove the wheel.
2) Feed small ratchet straps up through the spring, I use two opposite each other. No need to tighten them just yet.
3) Put jack under the hub and jack it up to compress the spring, take it high enough so as you just start to take the weight of the axle stands.
4) Tighten the ratchet straps to keep the spring compressed the lower the hub(releasing the jack). I use straps btw as my spring compressors are too bulky to get in the right place, straps are easier and I can hold nearly all the coils of the springs. The more of the spring you can hold the better, makes the next bits easier.
5) Slacken and remove the lower strut nut and bolt.
6) You'll need push up on the strut, compressing it whilst pushing the hub down a bit to lift the fork of the strut of the lower arm.
7) Open the bonnet and remove the three top mount bolts, good if you have an assistant as the strut assembly will drop a bit or you can support it with something.
Now you should be able to swing the upper mount down and out of the wheel arch whilst it's still connect by the upper arms, this will give you access to the strut top mount. Undo and remove the top nut then you can take the strut and spring away from the car to changeover.
9) Just reverse the above to install the new bits. If you're putting normal springs on you'll need to compress them before refitting, you can use normal spring compressors on to compress it then stick the straps on it to hold and remove the compressors. It's much easier if you're doing coilovers as you can just wind the spring down instead of compressing the spring.
I might have missed a few wee bits and bobs but that's the basics, not a hard job and certainly easier than touching the pinch bolts!! Gives a shout if there's anything you're not sure about.
