Went to give estimate for customer who wants a steep bank cut with a string trimmer. Customer is going to plant ground cover (English ivy, etc) on the bank. The bank is about 12' - 16' high and to steep to stand on. I was going to recommend spraying with roundup then proceed with planting once the vegetation is gone, but I'm not licensed for chemicals. If I attempt to cut with string trimmer I was thinking of charging 2 hours at my hourly rate. Would you'll take or pass on something like this?