[Goingnowherefast]

Are you trying to take off the caliper with the pads still in?

Here's what I do, and I've never had any issues getting the calipers out when I have to take out the rotors:

1. Remove wheel
2. Remove 2 clips that hold the pins in. I like to use needle nose pliers for this, but feel free to use whatever
3. Remove 2 pins + the retainer
4. Remove pads
5. Loosen 2 bolts holding the caliper to the knuckle (I've always been able to use a 3/8 rachet to do this. I'm not sure why yours was so tight on there)
6. Zip tie the caliper out of the way (I zip tie it to a spring coil)
7. Remove the rotor. Sometimes this just pulls off, but usually you have to drive a bolt through the holes in the rotor to separate the rotor from the hub if it is seized. I'm not sure what the tread is off the top of my head, but I can dig into it if you need.

See if any of that helps. If not, let me know exactly what part is holding you up!