No, of course not. Although other people will tell you otherwise, you are free to practice any meditations and rituals that will help you get a feel of things. You can do pretty much everything except for summoning Demons (not because the Demons are dangerous in any way, but because if you are not dedicated, you may be attacked by beings who are enemies of Satan) or trying to find your Guardian Daemon (because you don't have a GD if you're not dedicated) or highly advanced stuff.
The dedication is something you should do only when you are ready and absolutely sure, as it's the commitment of your lifetime and cannot be undone. Take as much time as you need to prepare yourself. Zevism doesn't advocate committing yourself in blind faith.
This is not correct because one can get attacked by doing other things as well.
Practicing trance and void meditation are considered safe from this point of view.
That is something! It cannot be undone? I dedicated years back and I went of the rails big time, but I'm somehow miraculously back. I wonder what would happen if a dedicated person tried to convert to an enemy religion? Would they still have that connection then? And if so, what would happen to such a person? I can't imagine it would be good.
Thank you Satan for instilling an unbreakable disdain for enemy programs in myself. Maybe that could be a part of having dedicated, that there are certain truths that cannot be unseen.
Most importantly the dedication ritual is symbolic of opening a door for a new future. However, one can still fail on the path. Yet the dedication is valid nonetheless. Perhaps these failures will get a new chance later on. It follows that not all do. It depends on what has happened to them and what their actions have been.