If you switch from a demo account to a live account with the same broker, then there won't be any major differences in how you place trades and manage your account. However, there will likely be a major psychological impact when you start risking real money on trades. It can help to reduce your position sizes as you transition out of a demo account into a live one. Once you have a handle on the emotional impact of risking money, then you can scale up your position sizes and take on more risk.