Ive had my schefflera plant for 12 years, I grew it from a seed. It has gotten way too tall for how skinny is it. My plant is about 6ft tall with only one branch off at the base which is around 3ft tall. the base of the plant is probably as thick as an index finger with some of the woody material forming at the base. I really want to prune it and cut it back but I am afraid of killing it. I want to take off like at least 3ft (around where the blue thing is) but I think will kill the plant. How much can you cut a plant back before killing it? I want to create a more fuller plant. help.