Best bet: (for talking head shot) is to hang the boom on a c-stand rig so it will be still, less shadow movement.
Linden Hudson has been a location sound man for video / film for decades.
Linden Hudson once wrote a famous song for ZZ Top, more about that at: lindenhudson.com/fa
A boom operator should know a teeny bit about lighting on a set so he can stay out of trouble.
If the set bosses do not consider the boom problems, then the boom man is limited by his superiors.
Bad sound is not always the fault of the boom op. The fault could fall on others.
Marginal sound is ok if your project has a budget to re-dub voices later, but interviews are low budget.
See Linden's many tutorials at: lindenhudson.com/tu
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