Tikona has the first demo, then pay policy.
When the demo guy comes, do all your checks. Physically check if the signal on your device is full. If it is not, you might encounter lag. Also, get the guy to install a slightly longer cable, which would help you move around your device/
router if needed.
Also, never pay cash. Always pay by account payee cheque only. Ensures that the money goes to the company directly. There have been cases where freelance agents run away with the cash. If he says he wont accept cheque, throw him out and complain to Tikona CC about such a guy.