It's not so difficult for non-programers to get into tiki. Or to have it up & running on your local server, or a remote server if you have time and patience to read "install" files, InstallTiki help files, etc.
And if the server you are trying to install it to doesn't fit your needs, you have time to learn, want to do the installation and tunning yourself, and the content of your site can be copylefted, the I suggest to read InstallTikiGForge and setup an account and tiki at http://ourproject.org (free, fast server for copyleft'ed content, and very suportive admins there)
Take your time, and ask step by step about the difficulties that may arise (whereever you keep going with your installation: fantastico, Damian server's, other payed or free servers, etc. ).
About using tiki for educational purposes, Damian forgot to point to http://edu.tikiwiki.org, the part of the Tiki educational concerned and involved in the educational uses of Tiki.
I wonder which tiki sites you browsed that were kind-of-discontinued. (?)
You may find some sites which are alive at: (at least, the ones I know because I'm a user there)
- http://gclub.ub.es (= http://gclub.ourproject.org)
and some of its child sites:
- http://uniwiki.ourproject.org (two year old site, with many more activity inside than the one linked from the homepage!
and all its subsites (see links of subjects at uni in there)
- http://www.moviments.net - Community site of an active cooperative
- http://riereta.net - another social-group-based > 2 years old community site
Btw, I hope you drop a line at http://edu.tikiwiki.org about the use you are doing of tiki (or planning to do!