Drupal 7.x

Hi there,
I am very very new to drupal and do not have a developers background. There are a number of Modules I want to install on my drupal site but I get a warning that they can't install b/c I need PHP 5.3. Evidently I have PHP 5.2.14. Can someone help me update to 5.3 (step by step) and tell me more about what this even means. I have looked around and cant seem to find an answer or place to even download it? Thank you in advanced.

I am working on a content type in which i need a start date and an end date. Now this would be simple enough using the Date module, however, I need to limit the maximum amount of days to 3. It seems in the date module I can trim years off the date picker but I can not limit days...

Here at Drupal.org, when editing your profile, there are different categories like "Work" and "Personal Information". I can't seem to replicate this on my D7 site. Can somebody point me in the right direction, please? Is this a feature provided by the dashboard module that is being used here?

Thanks.

I have installed drupal 7 and started building my first site (on drupal).
I needed to install a WYSIWYG editor and went thru all the necessary steps to do so,
for some reason, I cannot get drupal to acknowledge that I have installed any of these edtors (so far I've tried JWYSIWYG, Tinymce and CKeditor.
all of these folders are in the correct spots according to installation instructions (sites/all/libraries), But NONE of
them are getting picked up by drupal. When I go into configure/wysiwyg profiles I am told that nothing is installed. it lists them all, but

How do I grab just a specific field within a node so I can do what I want with it in PHP?

Basically I have content that has information about specific locations... And on certain days of the week, I want to grab certain fields from specified nodes and display them on the main page... I can write a PHP script to do it, but I just dont know how to grab the specific field DEPENDING on what day of week it is. Any ideas?

I dont know much about nodes and how to manipulate the fields.

I was wondering if anyone could help me to find/write the php code to call the description for a taxonomy term on it's page? I have built a custom page using views to display the term, and would like to put php code into the header to display the term description, but my skills in coding are lacking. Please help!