I've been developing a new CMSMS based site for a few months now and along the way I've picked up a few problems. Decided to work through this 'to do' list today and it seems most of them are down to file/folder permissions on the server, relating to modules not working as they should.

I'm not a complete n00b, but I am only a designer. I work for a pretty big web design agency and so I'm used to having Programmers etc. on hand for any such issues, but being as this is an *ahem* out of work project I'm on my own. (scary)
I've done plenty of reading and this sounds like my problem: Why can't I delete images or modules when I'm using FTP
An example problem is with the module Archiver, after installing via XML upload, the images are broken (obviously) but being as I don't have ownership I can't upload to the /modules/Archiver/images folder.
With other modules, when clicking "Change Permissions" in an attempt to fix other problems, I get the message back "Couldn't change permissions on some files"
How do I go about fixing this? I've checked the File Creation Mask (umask), but this has been set to 022 since the CMS was first installed. Will calguy1000's script to recursively open up all files in a subdirectory help me? Where will I find it?
Cheers,
T.O