from Dr. C.Locker’s The Basics of Time Travel Chapter I

“Time travel skills vary depending on how far through or across time you travel, the further away from your originated time* you go, the greater your expertise in time travel needs to be. Not only because of the endless knowledge of history or the skill in anthropology, physics, chemistry etc…needed to predict situations in the future, but also the mental and physical preparation needed to deal with the dramatic time shifts your mind and body has to deal with.
There is no end to to the study of time travel, your knowledge of this subject must be as infinite as time and space itself. You must be in good physical condition to travel regularly. The physically and mentally weak are at risk of becoming subject to injury and disease.
Those who are under the naive impression that time travel is something that can be used casually, will only have themselves to blame if they find themselves stuck in the eternal limbo of the matterless void.

*Originated time- The time in which your current physical state (body) became manifest.”

from Dr. C.Locker’s The Basics of Time Travel Chapter II

“It is believed by many in the field of time travel that some time travelers are lucky enough to be born with a gift that enables them to travel without a physical device. These are sometimes referred to as ‘free-travelers’. They are able to connect with the space time continuum purely by the means of their minds. Although they may not be able to literally transpose their existing body into a different time – unless extremely advanced and well practiced in their skills (the event of a free traveller achieving this has only ever been heard of in legend*), the ability to mentally exist in the future or the past is just as valid a method as any other. You may ask ‘how can you affect the environment of the past/future, if you do not physically exist in that time?’. The answer is that these beings can possess an object both animate and inanimate that they can control as perfectly as their own bodies, the ability to possess a living being obviously gives the free traveller visual/audio/sensory experiences and so is the most effective method. As with all time travel, abilities vary. The most skilled beings will be able to occupy and control the body of a human being for a lengthly period. humans are far more difficult to occupy as the gifted being must learn to overcome the existing conscience of the human they wish to possess. More amateur free-travelers usually end up occupying an inanimate object and as thier skills develop, will be able to move that object with their will. Some say this could explain the phenomenam of ghosts and poltergeists, though their is no conclusive evidence, as the whole notion of free-traveling is still under debate. The problem being, that free travelers can only provide evidence of where they have traveled, with their own recounts of the event, they cannot bring physical matter back with them or travel with other people.”

There were only a few of us left. We were trying to get out of an underground room, where the walls were covered with invisible writing that flouresced when a certain light was shone on it. We searched vigilantly, even under furniture, as we needed to work out all the numbers from the puzzles, and add them up to find the code for the door.

We eventually managed it, and were outside in very bright sunlight, everyone looked smooth and beautiful, like we were avatars.

It was some kind of residential training programme or workshop. The building was a bit run down, low rent, big windows, but somehow dark. I think the weather may have been bad. I knew most people there. I had been on the programme before I think, or at least it was meant to be different but wasn’t. Most people were unhappy with the programme and there was a lot of grumbling, but everyone seemed to have bonded quite well into a group. I don’t remember anything else.

Postulates that the observer obeys different physical laws than the non-observer, which is a return to vitalism. The definition of an observer varies from one adherent to another, if present at all. The status of the wavefunction is also ambiguous. If the wavefunction is real the theory is non-local (not fatal, but unpleasant). If the wavefunction is not real then the theory supplies no model of reality.
http://www.hedweb.com/everett/everett.htm#problems