It's held in there with rubber isolators. Just disconnect everything and pretty much tug it up and out of the car.

I'd recommend doing it in this order:

1) Clean the area VERY well with an alcohol prep pad or something similar and let dry. Ensure you get ALL the dirt off as any contamination of this can cause problems in the future.

2) Mark all lines going into the ABS controller so you know where to put them when you go to reinstall it. Easiest way to do this is wrap a little blue painters tape around each one and number 1,2,3,4,5 and 6. Then make a little diagram of it indicating the front of the car and then note the location of each numbered line.

3) Remove all the lines and cap off both the lines and the ABS controller with something to prevent dirt from entering the lines or the controller. Usually you can find caps or plugs at a hardware store. Pick up a few different sizes as I don't know exactly what size you'll need. Clean up any spilled brake fluid with a clean rag.

4) Remove the electrical connector from the ABS controller, place end in a bag and use a zip tie or rubber band to close around it. The part about cleaning up all the brake fluid in the last step will keep it from getting into the connector this step.

5) Lift up on the ABS controller rocking it slightly front to back and side to side until it comes out of the holes. It may pull the rubber isolators with it or they may be left in the car. Make sure you keep them as I don't know if they will come with the new unit.

When you go to put it back in, just do the reverse of the above steps. You will need to bleed the brakes and it will not be fun but just take your time and have plenty of fluid so you can continuously top off the master cylinder. If it gets too low, you'll have to redo all the bleeding so be sure to never let it get below the max line and you'll be fine.

Good luck and take care.