Checklist for going the Unicode way with Perl

I am helping a client convert their Perl flat-file bulletin board site from ISO-8859-1 to Unicode.

Since this is my first time, I would like to know if the following "checklist" is complete. Everything works well in testing, but I may be missing something which would only occur at rare occasions.

This is what I have done so far (forgive me for only including "summary" code examples):

1. Made sure files are always read and written in UTF-8:

   use open ':utf8';
   

2. Made sure CGI input is received as UTF-8 (the site is not using CGI.pm):

   s{%([a-fA-F0-9]{2})}{ pack ("C", hex ($1)) }eg;    # Kept from existing code
   s{%u([0-9A-F]{4})}{ pack ('U*', hex ($1)) }eg;     # Added
   utf8::decode $_;
   

3. Made sure text is printed as UTF-8:

   binmode STDOUT, ':utf8';
   

4. Made sure browsers interpret my content as UTF-8:

   Content-Type: text/html; charset=UTF-8
   <meta http-equiv="content-type" content="text/html;charset=UTF-8">
   

5. Made sure forms send UTF-8 (probably not necessary as long as page encoding is set):

   accept-charset="UTF-8"
   

6. Don't think I need the following, since inline text (menus, headings, etc.) is only in ASCII:

   use utf8;
   

Does this looks reasonable or am I missing something?

EDIT: I should probably also mention that we will be running a one-time batch to read all existing text data files and save them in UTF-8 encoding.