Always follow the advice of your guides, they are highly experienced and have been taking part and leading teams on your challenge for many years.
Take everything nice and slowly. There is plenty of time on each given day to complete the required distance so there is no need to rush as this will tire you out more than necessary and increase the chance of injury or accident.
If you have any questions or concerns during your trek then please ask. There is no such thing as a stupid question, and it is much harder to help if any potential issues go unoticed.