OP
1shortcircuit
yep i am jumping the gun. i always worry about future problems !!!
Being prepared is one thing but giving your attention to other areas of concern whilst carrying out electrical installation will catch you out. Electrics is all about working methodically so once you have proven continuity and IR THEN you can think about plaster. If you are going to cap cables then the testing will need to occur after this because it is possible to nip a cable in the process. If plastering direct then you will still need to use cable clips on the cable to secure them to the wall. If you do not do this then the cables will keep bouncing off the wall and probably end up being visible after you have plastered.
One thing I would add is, get that ****ing sparky in to help/advise you appropriately. Regardless of what you are paying him for his services he will be responsible for the entire installation of the circuit/s if he is signing it off!