I am nervous about swimming within a group of people in the sea. Will I get advice about this?

 In

Your coach will have experience to pass on to you in order to ensure you are prepared for event day and on the day itself, you will quite likely be starting in a smaller less competitive group. There will also be an open water swim session at the end of your 6-week training period and this will help familiarise you with having other swimmers around you in the water.