OP,
what type of tile or slate are you thinking of working on?
The pic you say is from the internet - well its a poor job. A very poor job.
The front apron area is missing a batten and tiles, and the roof pitch seems to change(photo?) - it will leak.
The apron upstand should have gone in the bed one course above, and could have returned at the stack corners - the stepped flashing could have been wrapped around the corners.
The apron cover should have been spread wider.
The back gutter is a dogs dinner - well wrong. Ita a possible run-off leak.
Nothing in leadwork is "a nightmare to do" if you know what to do. Bossing lead is a case of slowly moving lead from one place to another - you dont hammer it into shape or position, you carefully boss it using a bossing stick.
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