I think your going to have to edit your post about how you got it.
Anyways 30-35 mg is good for a breakthrough. Read the
FAQ For more info on how to smoke
Also, I know you say you want a breakthrough, but imo you dont have that much experience so I would tread lightly.
I think its better to start low like maybe 2, 15mg trial runs so you get your technique down and familiarize yourself, this should prevent excessive waste as well. Once you have your technique down and have a nice taste I would go for a 30-35mg dose.
Anyways good luck and be safe, I know the feeling of wanting a breakthrough, but trust me when I say its good to be patient and careful with this stuff.