Hi
Installing Trustpilot is a job that can be done within 30 minutes. It depends obvious on the software you are using. You do not write if you have WordPress, Joomla or anything else, there might be a dedicated plugin otherwise the Trustpilot script must be included.
I will be able to do this for you but need
1) The Trustpilot api key
2) access to your CMS
Get in touch with me to get this done today.
Fedor Alphenaar