There is a guide yes mate.
I've just finished doing mine about 5 minutes ago, piece of pish you don't even need a guide.
1. Take the wheel off.
2. Remove the bottom 13mm bolt on the carrier, loosen the top one a few turns. You'll need a 17mm spanner to hold the larger bolt or it will just turn with the 13mm.
3. Lift carrier up, remove pads & shims.
4. Insert new shims, and pads.
5. Use a G-Clamp to force the piston back so there's room for the carrier to drop back into place.
6. Screw the 13mm bolt back into the bottom.
7. Tighten the top 13mm again.
8. Wheel back on.
Tools requires:
1x G-Clamp
1x 13mm spanner
1x 17mm spanner
19mm socket for wheel nuts
Good to have:
Hammer, to bang old pads with a screwdriver.
Time:
40 minutes - 1 hour.
Brake pads....Done