Cleaning the outsides of a gutter is piece of cake normally,just doing it wfp.Most people would want the insides cleaned out as well though,being cluttered up with leaves etc this time of year.I personally don't get enough call for it to warrant a gutter vac and just use a ladder and bucket for the odd times I get them.I'm a bit unsure on pricing myself as it happens.I read that some people charge £2 a metre but then I read Matt on here say he charges £5.He seems to know his stuff but I think for that he pressure washes it all as well.The underlying opinion on here seems to be don't undersell yourself.