domain pointing - 123-reg to google sites

I am in need of domain pointing expertise! My current domain is easystrings.co.uk and www.easystrings.co.uk and I would like to point it to Google Sites. I understand that this is a more challenging task and will require update to the domain registrar's nameservers. This should be a relatively straightforward job for someone with the experience, and I would appreciate it if you could please reach out to me if you can help! Thanks so much!