Isn't occasional slippage unavoidable?Demo and Live could be same but in Live, your might don't have your expected price because of votality. But big brokers could minimize slippage.
The first step you can do in your trading life is to think thoroughly whether you want to enter the world of forex or not. Forex market is an unforgiving place for the weak. You need to have a set of skills to survive and conquer the market. It is not fun and games. You need to enter with a serious approach.