It sounds easy I know BUT it took me a while to perfect my breakie :)
First things first, the egg should be at room temp, if you keep them in the fridge take them out 30 minutes before cooking. Pierce the bottom of the eggs to stop them cracking.
Bring the water to a boil, carefully put the eggs in using a tablespoon.
When the water comes back to boiling point, reduce the heat so the water is simmering and begin your timing.
I use large eggs so only need to cook them for 4 minutes for a runny yolk OR 6 minutes for a medium-boiled egg, where the yolk is only slightly runny.
For medium sized eggs, reduce these cooking times by one minute.
For extra large eggs, add on one minute.
If you want hard boiled leave them in for 10-12 minutes.
Happy breakfast :)