I make and use my own climbing sticks, usually 4 sections of 5ft to a stand but there is the odd time i would like to get a couple feet higher or some places i do not feel like lugging in my sticks so i bought a few tree steps the other day.I waswondering about how many steps from the ground up to say 20 feet would i need? I have never used them b4. I realize it depends on how far you want to space them etc, but lets just have an average. thanxs.