Although by design the house is RCD protected so the worst that would happen would be a blown fuse.
RCDs won't protect you if you put yourself between line and neutral. And you'd be pretty damn cooked by the time the MCB tripped. And you can still be killed by a shock if you have a heart condition, RCD or no RCD.
Please leave the electrics to an electrician if you can't even figure out the difference between AC and DC..