The problem you have with this sort of question is you will get loads of differant opinions, some people agree with boiling and some don't. some will tell you to soak for ages and some will say a few days. It is because we all have our own taste and how things look.
I myself like to see a bit of tannin in the water, plus i think that if you are going for an Amazonian looking tank with lots of plants, neons, cardinals, angels, Discus etc. fish that like the softer waters they will like it as well. But this is only my opinion. If you was to put it into your tank now and you didn't like the colour then you could always put the carbon in and after a few water changes it will lighten even more until you get your desired look.
I am not saying that i am right, i am just giving you another option.