The most important thing about this site is the content. Let there be no doubt about that.
So if you have some valuable content, and it is a choice between slapping it up on the site any old how, or trying to obey all of these guidelines and therefore never getting around to it, do the former.
If you want help in making your content meet these guidelines, then by all means ask the webmaster for help.
Most of these guidelines reflect the general consensus for how things should be done in any quality publication. A few of them are, perhaps, coloured by the prejudices of the webmaster. You will just have to live with that.