WRITER: Replace Links ?

Can LibreOffice do the following:

1.) Create a style for the word ‘help’ in helvetica-14pt-roman.

2.) Create a hyperlink to a help document, for the word “help”

3.) Search for the word “help”, and display a list of where the word ‘help’ appears in a long document (400 pages).

4.) Replace all the instances of the word “help” created in steps 1 and 2.

I am new to the platform, so could you please answer in step by step procedure as in ‘how’ would I do that ?

Thank YOU ahead of time!

Miles.