Lost City quest.... (runescape)?

I think i have an idea how to beat it...go behind the fungus and shoot arrows...it doesnt really matter wat lvl? my range is 5...combat is 66...so...you bring arrowtips, headless arrows, bowstring, bow (u), leather, knife, needle, food, potions, thread, and that's it? make full leather, then make bow & arrows and shoot behind fungus? that right?