Easy to replace, but first you need to get a C-clamp to compress the caliper
piston in order to lift off the caliper and a find a hex socket, (or torx socket)
that fits into the caliper pins that hold the caliper on. These sockets fit onto
a 3/8 drive ratchet.
On mine being a 1998, the caliper pins still use a hex key (socket) and
it's 1/4 inch hex (7MM). On some of the newer models, they may have
gone to a torx caliper pin, which may be a torx-45.
The caliper has to be suspended off the disc rotor to prevent undue strain
on the brake hoses with a coat hanger wire . Tie it to to the upper suspension arm.
MAke sure that when you put the calipers back on, do not twist them around as this will tighten up and possibly kink the flexible brake line and cause it to wear down or rub against a suspension part. Its easy to do, a brake shop mechanic did just that and luckily it was caught a short time later when I had the truck up on a lift to get an alignment.