Yea it's good to test each and every indicator, if you wanna use some. And it's better to test the indicators in a demo account as well, and I guess it's good to test one indicator at a time, for certain times of trades, to see how it works, good or not good, then switch to test another one in the same way. However, I guess to test several or couple of the indicators is enough, if you could find something working good for you already.