You should not do that without someone who truly understands and knows what they are doing on the main sheet. You must have that person on the main sheet from the first hoist until the boat is well clear of the other boats nearby and any hazards on the way to deep water. One good puff and the main is diving the boat not the helmsman.
dah. Loosen the mail sheet first, so it runs free, the boat won't move. You are still tied to the mooring ball.
