Problems installing on VPS CPanel whm running CentOS 5

I think I have some permissions problem, instead of entering commands, can I just set up all permissions manually by myself?
Are all directories need to be set to 775 and files to 755?

BTW I couldn’t change the Apachegroup got an error

root@host [/home/myuser/public_html/suite]# ps -ef | egrep ‘(apache|apache2|httpd)’ | grep -v whoami | head -n1 | awk ‘{print $1}’