Possible Short under dash board causing right head light problem

Hi i have a jeep grand cherokee 05 limited 5.7 l

I have elecrtic issues on right head lights got it
checked out and they said everything under hpod
is fine wires and fuses they think the problem is
under dash board and it will cost alot of money to
find the short or problem beacause of tome
consuming by taking the dash board off is there
way i can do it my self and check wires for short or
other problems please help any answer would help
I i have pit so much money in to this car i went
broke