The Most Rev Justin Welby will officiate the highly anticipated ceremony on May 19, but even the Church of England's most senior cleric is not safe from the nerves of the big day.
Speaking on BBC Coventry & Warwickshire he told of how he is preparing for the ceremony.
Mr Welby said: "I'm always nervous at weddings because it is such an important day for the couple - whoever they are."
"I've made a couple of cack-handed mistakes over the last couple of weddings I've been involved in and I'm thinking this is probably not a good moment to make it a hat-trick."
He has previously admitted to fearing he might drop the ring during the service
When asked by presenter Lorna Bailey how he's preparing himself, the Archbishop said a line from grime artist Stormzy's song, Blinded By Your Grace, was helping him in the run up to the nuptials.
Mr Welby explained: "There's a line in that - 'I stay prayed up and get the job done' - I think that sort of sums it up.
The Archbishop, who is the second most senior figure in the church after the Queen, who is supreme governor of the Church of England, has already had an instrumental role in preparing Ms Markle for the wedding.
In March he officiated as she was baptised and confirmed into the church in a secret ceremony, describing it as "beautiful" and "very special".
Stay up to date with the latest news stories from a Christian perspective. Sign up to our daily newsletter and receive more stories like this straight to your inbox every morning.
