its pretty straight foward mate,
take off the wheels (1 at a time) and you'll see the caliper
this is held in place with 2 bolts, 1 top 1 bottom
loosen them off, and the caliper should slide off the disc
take out the old pads, now with the new 1s, their chunky, so you need to push back the piston in the caliper, front calipers are easy, you can push them back with a vicegrips, the back 1s are the same, just smaller and a bit tedious, but you will get it eventually
just copy the way the pads come out, put the new 1s in the same way,
pads come with a metal clip on 1 side, make sure that goes on the inside of the caliper
then just assemble it back the way you took it off
you'll need to pump the brake pedal a few times when its all back together, you'll eventually feel as they are normal, maybe after 5 or 6 pumps
if you get stuck on anything, just let me know, hope this helps you mate