Hey Ennio -
I just set my first quad up as well, and I was able to find a few posts on some ways to make it a little easier to move into it.
Within GSC, click on the "Stabilization" tab. Once there, there are 3 tabs for each of the 3 flight control setting banks. To help, I started by moving the 3 main sliders (Attitude, rate, and yaw) back by about 50% in the first bank. You can pick whatever amount. I then moved all 3 sliders in the "Expo" windows (to the right of your screen) to a higher number, like 30%. This means that you have to push more stick to get it to move in the direction you want it to go. On the next bank, I just made the adjustments smaller. On the third, I moved them forward just a bit. This should give you a really gentle setting to start out on, and you can move it forward as it gets more managable.
Also, on the altitude tab, I did the same things. On the chart with the 5 circles, I put the 3 center circles closer together. This means taht, as you move your throttle up and your quad rises, the middle section of the throttle stick starts to affect the height less. I set my circles to 0-30-40-50-90. This means that at 25% stick, you get 30% throttle, at 50% stick you get only 40% throttle, and so on. So it gives you more forgiveness on your height adjustments.
There may be better, more complex settings to make this stuff easier, but these were the first few things that I found worked for me, also being newer on my first quad.