Depends on the other 5 email account services.
1. Do they allow forwarding?
If yes, then log into each account and forward the email to your gmail account.
2. Do they allow POP3 access?
If yes, then log into gmail and set it up to download the email from the different accounts.
It isn't hard either way, but the forwarding is the easiest to set up. There is ample help within gmail itself for setting up your gmail to use POP3 for the other email accounts.