i dont know how much a caliper would cost, it shouldnt be THAT much.
brake jobs are so easy, just take your time. you need basic hand tools to do this(pliers, screw drivers, wrenches, and sockets and ratchets.) you might have a hard time removing the two phillips screws that hold the rotors on because its best to use an impact driver on them. you can use a regular phillips screw driver bust be carefull not to slip when you're turning or you'll strip the head of the screw.
for the pads its just remove and replace. when you put the new pads in you'll have a clearence issue with the caliper piston, but dont worry. use a large set of pliers or a clamp to push the piston back in, then slide the caliper back on the pads and bolt everything up. its that simple, just dont tighten too much or you can break the bolt and/or strip the threads in the bracket.
for the rear calipers you would need to turn the piston back in, just use a big pry bar for that if you have one. i hope this helps and good luck


oh and to replace the caliper all you need to do is unbolt the brakeline, take the caliper off and bolt the brakeline to the new caliper. thats all. after you do this you're going to need to bleed your brakes because after unbolting the line causes air to get into it and you'll have bubbles. do a search on how to bleed brakes. its pretty easy with a friend.