Upgrading Drupal

I'm about to attempt an upgrade from 4.6.10 to 4.7. The upgrade.txt file says:

3. Remove all the old Drupal files then unpack the new Drupal
files into the directory that you run Drupal from.

So exactly what comprises the old Drupal files? Does that mean all the modules including contributed modules or only the core modules or neither? Would it make sense to feed the output of a tar tzf into a perl script that removed files of the same name?

Thanks,
Jim.

A small module I have uses the old $form stuff, but this is causing it to not work after upgrading to 5.1. I tried going through the documentation to see if I could figure out how to update the 4.7 $form code to 5.1 compliant...but I couldn't figure it out mainly due to having no experience with writing drupal modules. Help would be appreciated.

I'm upgrading from 4.7 to 5.1 and had most all of my site in flexinodes. I set myself up a test site and installed 5.1 with flexiconvert. I did one flexinode type and found that it imported the fields into the equivalent field, but it also put all of the fields into the body section (which I used as one of my fields from my old one). It looked like this:

old flexinode:
Field: General Info
Field: location
Feild: Steps

CCK node:
Body: General Info
Field: Location
Feild: steps

In drupal 4.6 i made use of a mixture sections module and control of blocks to substabtially alter the appearance of the theme depending on what path setting and content typewere selected. In 5.1 to my dismay i just discovered that blocks can be set to content types only with php cofe (which i could live with) BUT that using the PHP code turns OFF the show block by path functionality

I'm on the step of "5. Remove all of the old files and directories from the Drupal installation directory."
Simple question, what files/directories do they actually want removed? Saying All is kinda confuses me because I know some of them are ones I've put there so obviously I don't want to delete those. Can anybody make it more specific and let me know what to delete.

I upgraded to 5.1 recently, and found troubles with the stylesheets. Specifically, I found that I had to change the permissions on all the module and theme folders on the server to 755 before the styles worked consistently. Is this normal, and is it documented anywhere?