Decomposition is slow at high altitude, so the digging depth is important. And yes, you need to use toilet paper because water is not that easily available or it is not in abundance. Last thing is finishing up when the deed is done, make every attempt to cover up your business with plenty of soil and few large rocks. This will prevent wild animals from rooting it up or other hikers from stumbling on it. Yeah, that is very much possible. Hope this helps guys