if you'r leaving in a tropical region then you dont have to be carefull you can do whatever prunning and wireng of ficus benjamina but if u have a full and winter climate then you have to be carefull...here in the philipines all kinds of ficus is a monster they grow encridebly fast even they are cut!. In are farm we have a ficus growing 12 by 12 meter trank wide and 40 meter tall.