Make sure you have a clean set of underwear by your side for when the red dot appears. You'll need them if it is disappointing as you wont be able to trade out as the market makers and systems will be overwhelmed.
Don't expect any favour either from the market makers either should the wire logging RNS not hit the right notes. They dont own any shares and they are completely ruthless. In fact nothing would please them more than to churn all the same shares over and over again.
Is it not far better to sell all or sell half and park up to limit your exposure and risk. You can always buy back for maybe 0.25p extra if it is positive.
1.5p to 0.25p on £10000 would leave you with £1666.66. It's high stakes gambling