It depends if you are a beginner, which I assume you are, or an advanced trader. As a starter, don't invest a lot. At first, get to know bitcoin trading system, try to trade with smaller amounts as it will definitely bring you a basic knowledge of it.

In my opinion you shouldn't go straight to 1BTC, as it is a huge amount of money. It will hurt to loose that much if something unexpected happens, thats why, start with smaller amounts at first, like 0.1BTC. It is going to be a slow profit, but less risky.