I'm not sure many of us currently living in 3-D can probably answer your questions from personal experience. If any of these ideas about ascension etc. are genuinely true then it seems we will find out soon enough anyway :)

What I find interesting about all these ideas is the more and more definite information that is being channelled regarding timescales. I've noticed a shift away from the vague and general "everything will change soon" ideas we used to receive back in the 1980s/1990s to more precise information...most of which seems to revolve around 2012 as being significant as a turning point. Bashar has even given us a fairly precise alien contact timetable.

Either a lot of channellers will be eating their words within the next few years, or some significant changes are coming.

According to Wendy Kennedy's The 9th Dimensional Pleiadian Collective (TNDPC), the process of ascension to the fourth dimension will become obvious by next year (2012). (I know Rob's TReb Bor yit-NE calls these densities and reserves the word dimension for a different concept).

If I remember correctly (and this is purely from memory so may be slightly inaccurate), TNDPC say that the probable timeline is that the fourth-to-fifth dimensional/density transition will happen about 70 years after the third-to-fourth transition.

They say it's difficult to make predictions about what people will experience because different consciousnesses may experience different timelines depending on personal vibrational choices. Some may not even choose to make the transition to 4-D and will have to incarnate elsewhere to continue in a 3-D experience, since Earth will now be 4-D (and then 5-D).

I guess your question was partly inspired by my previous question Is Earth a giant extra-terrestrial ‘experiment’? so here is a snippet from the channellings of The 9th Dimensional Pleiadian Collective that may offer some further information.

The link to the full video response and article are at the bottom of the quote.

The major difference in 3D and 5D is that you have an awareness that you are a divine being, and you also have a multidimensional perspective.

You can look at other timelines, see what a choice would mean, how it would be created, generated in form, and then decide to step into or align yourself with that frequency. The other thing with 5D is that you do not experience time, not as you experience it here. In the higher realms we know that time is simply a marker.

Now, there are multiple versions of the planet that, as we have said to you before, are coexisting one on top of another. That is still true to some extent, but the timelines are separating. Some versions have a very distinct 3D version and a completely different 5D version.

Others, the 3D version and the 5D version are still close together because the agreed upon set of circumstances of the collective are rather similar. And so there is no need for the separation, or the pulling apart of those two versions.

Now, what you experience is going to depend on your frequency. So if you’re vibrating in a low resonance, if you are holding fear, and you are not conscious of the fact that you are creating and generating your own reality, that your reality is a reflection of you as a vibrational being, what you perceive is that your worst nightmares have come to life.

You don’t understand that they’re there as a reflection so that you may integrate. For those of you who are waking up, who are aware and taking responsibility for all of your creation, you’re going to have a very different experience.

The 9th Dimensional Pleiadian Collective - Full article / video