How was it that the UK and Norway conveniently managed to opt out of the euro zone?
The countries that were in the EU before the Euro was introduced have the option to join or not. The UK came close to it in the early 1990s, joining the Exchange Rate Mechanism, but fortunately we did so at too high a value and the market spotted this and bet against us. So we came out. It lost us a lot of money in the short term but in the medium term our economy picked up and thankfully now any politician who suggested it would be out of a job permanently.
Norway is not a member of the EU so is not obliged to join the Euro.
All countries that joined the EU after the Euro was introduced, including Poland, in theory have to join the single currency 'when the economic conditions are right'. In practice, given the mess the Euro is in, it's unlikely it will ever be imposed on a reasonably well-performing economy. Poland has achieved some of the best economic growth in the EU since 2004; I would be amazed if the EU risked you leaving by trying to impose its crackpot currency on you.