Okey, thanks for your replies.
I ‘ll try to do that myself. I was reading short instructions but I get confused over which WP files should I delete .
Do I delete these files via FTP or via File Manager in Cpanel ?
As far as I understood, I need to make backup file for my home directory ( done), backup my database ( done).
The trouble is, that in my folder where WP files are, there are some other directories, such as CGI-BIN, some Fantastico files etc.
Should I delete files one by one and then upload them one by one ?
Pretty obvious for some, but I am not so savy since I had web hosted blogs before and I want to upgrade my blogging over WP cause, as we all know, it’s just great blog engine.