Identify best way to access gutters from roof or off ladder, gutter type/profile and if guarded/meshed.
Some Factors to consider are oxidized paint on iron roofs will leave glossy foot prints (unless cleaned first), type of Tiles are they robust enough to walk on, is the roof safe to walk on.
Select corisponding tools access roof perform work.
Dispose of waste off site or on as per prior comunication/quote.
clean up rinse off and mess (clean outsides of gutter if part of job).
Gutter guards go against the function of gutters and downpipe leaf catchers are a much better solution.