Is it at height?
If at height how is the worker going to reach this height? (Scaffold, Tower system, ladder?)
If the ground is not level or solid does the worker know what, and how, to do to correct this?
Does the person doing the job have the right tools?
Are they decent quality or cheap 'shed' type tools?
Does the user know how to use them, correctly!?
Has the person doing the repointing got any experience or is this their first try?
Then of course you have factors outside your control such as the weather.
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