No need for a guide mate, pretty simple job. Pull the carpet back in the boot and lights are just bolted in, Undo the electrical connectors and if they're bulbs you may have to swap the bulbs over and just re-connect and make sure to keep the foam padding around the car to keep them from rubbing and letting in moisture. 
CMR
⭐
Yeah as above, 0.5/10 on difficulty scale.
Theres 4 nuts on the back of each light. undo them (careful not to drop them, theyre a nightmare to find again) then the whole unit pulls out and the bulb sockets twist out. simples