One aspect that people tend to neglect is knowing their own CV. Learn it back to front and upside down. Talking through your CV provides structure to the conversation, meaning you can spend more time talking about the important things, maintaining focus, whilst keeping those nasty nerves away.
Remind yourself of the key sub contractors, consultants and clients involved in each scheme as you may find common ground which is a really handy way to establish a good rapport and showcase your experience. Also key information like the form of contract, duration, what stage the project was at when you joined and left, along with the value of the scheme. Clients often ask for examples where you overcame challenges, so reflect on how you tackled any issues and demonstrate how you performed to a high level.
Confidently talk about projects you enjoyed working on, so they can see you are engaged in what you do and make sure that you self-promote; there is no need to be embarrassed talking about yourself. This is your time to really express what you can do well. Your CV is your golden ticket, it is one of the elements that got you the interview – so trust in it and use it to guide you through.