We'd recommend communicating to your client to let them know and give them an idea of when you may be able to complete it by. Remember that we are on hand to assist you should you need to find an alternative Virtual Assistant to complete the task. Bear in mind that your client may instruct us to find an alternative Virtual Assistant also.
Can't do It because you are not the best freelance Virtual Assistant to do it?
If you haven't yet accepted the task then simply decline it stating that you don't have the right skills. If you've already accepted it and it's become clear that you're not the best Virtual Assistant to complete the task then click the red help button and contact us.