Njord is right.....you should lower your bodyfat naturally by a MINIMUM of 10% before you start using gear.
Your best bet is try to get your source to swap the deca for test prop.......if he wont swap it then you may just have to place another order for test and keep the deca aside for your next cycle.
If your really desperate you could technically run the tren alone.......however it isnt advisable nor will it be as effective.