The most valuable advice I can give you is to not touch the hairs for at least 4 months prior to electrolysis.
Here is an example of the results of a single clearance on the legs of a 22-year-old woman who had received some laser sessions several years earlier.
The peculiar horizontal stripes are the result of a bad application of that laser treatment.
BEFORE (February 2016):
AFTER first electrolysis clearing (June 2016):
The first full clearance took 5 days with an average of 7/8 hours/day.