They put a search funtion on this forum for a reason. If you had bothered to search you would have seen that there is a wealth of knowledge on here about that particular chemical already.
I have consumed this chemical on 2 occasions, which have been discussed in a previous thread so I won't go into detail. To sum it up, just be careful as this is can be a very dangerous chemical, it is not a toy. If you can weigh your dose before hand with some good scales, it is not too hard to get you hands on some 2mg accuracy ones. The diference between a 20mg and a 35 mg dose is massive.
And I second what kwiksand said, don't insufflate it. I have done this before with about 1mg and I rekon that snorting crushed up glass would hurt less. Most overdoses have been associated with this method of administration.
On a side note, I wonder where this chemical is coming from. Most research chems we used to see were imported. I wonder if someone in Australia has found out how to make this. 2,5 Dimethoxy-Benzaldehyde is unwatched in Australia I believe. Although T7 would be very hard to manufature, there are other 2Cs that would be more attractive to the clandestine chemist.