afternoon arboriculturist arborist ascended ascending belt chainsaw cleaning clearing climbing clouds cutting dark descending expertise Harness height high lines lop lopping palm palm-tree pollarding professional prune pruned pruning removal remove removed risk risks risky rope safety safety-harness secured silhouette stormy suspended suspension tree-lopper tree-lopping tree-management tree-surgeon trees trim trimming Australia balancing climber danger dangerous ear-muffs helmet man-at-work noise-reduction Noisy ropes safety-glasses sawing tall-tree tree up-high work workman