OK, you need a 11mm flare wrench to remove the brake line. If you use a regular open end wrench you'll probably strip the hex head on the end of the brake line.
You'll also need a 19mm wrench to undo the two bolts that hold the caliper to the trailing arm. The easiest way to loosen these is put the wrench on the bolts and hit the wrench with a brass hammer.
You'll also need to know how to bleed the brakes, when you put it back together. This isn't difficult, but if this is new territory for you, you may want to take it to your local tech and have them handle the removal and reinstallation.
First you depress the brake pedal and hold it in with a broomstick or something of that sort, this will keep your brake fluid loss to a minimum.
Next you pull the little clips on the pins than hold the brake pads, gently drive the pins through with a long thin punch. Pull the pads. Press the pistons into the caliper with a piece of wood (if possible). With the brake pedal depressed you may not be able to push the pistons in very much, but if you have the pads out, that's all you really need to do. Especially if you are having the caliper rebuilt, it will be completely dissasembled anyway.
Now take your 11mm flare wrench and remove the brake line, where it enters the caliper. If you've got a 3/8" rubber vacuum cap you can put it over the brake line to keep fluid loss to a minimum. Bend it slightly out of the way.
Take your 19mm wrench and put it on the bolts that hold the caliper to the trailing arm, it it with the brass hammer in a counter clockwise direction to loosen the bolts.
Hope this helps.
PK