Are you using a split or solid core CT? It’s much easier if you buy a split core CT. You simply clamp it around the main live feed and don’t need to disconnect any wires.
For the live and neutral for the Pzem you have 2 options:
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If your consumer unit is close to a mains socket wire up a plug between the socket and the Pzem. This is the safest as it’s just like wiring up a plug for a TV or a kettle etc. Certainly this would be a good way for you to test your system until such time as an electrician completes the installation for you. If you only have a solid core CT I wouldn’t do any more work inside the consumer unit based on your knowledge of electrical wiring.
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Alternatively you need to take the feed from the consumer unit. This is blue and brown from the trip switches but if you are having to ask the question I would leave it to an electrician to do.