It is good that you wont to do things properly and realise that being able to test your work before and after energising is part of that. However, from the above comments the folk here are a bit concerned that learning via YouTube with a MFT is potentially a very dangerous hobby.
Many of the MTF measurements are "live" tests with things energised, they are obviously dangerous. However, the "dead" testing before that can be far more dangerous if the equipment is if fact live and you did not know that.
So the first step you ought to learn is the safe isolation process, and that means looking for a decent voltage tester and (ideally) a proving unit first. Never rely on a mlutimeter or MFT to prove dead, there are so many ways that can go wrong.
I'd go so far as to say ALL MFT tests are 'live tests' on the spirit of EAWR (Injection of a charge into a cable them males that cable charged).
(Anally retentive extracts below)
Charged/live (as used in regulations 8, 13 and 14)
47 The terms ‘charged’ and ‘live’ have different meanings; they are not defined in
the Regulations so they take their ordinary meaning. ‘Live’ means equipment that is
at a voltage by being connected to a source of electricity. ‘Charged’ means that the
item has acquired a charge either because it is live or because it has become
charged by other means, such as static or induction charging, or has retained or
regained a charge due to capacitance effects even though it may be disconnected
from the rest of the system.
Live work
50 Live work is work on or near conductors that are accessible and ‘live’ or ‘charged’.
Note that testing of live exposed conductors using a test instrument is live work.
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