About how many grafts will I need? More questions below. Hairline Lowering / Forehead Reduction / Hair Transplant.

Hair transplant surgery will not give you the fullness of your existing non-thinning hair. You need need multiple surgeries to accomplish your goal.  This is why you need to see a doctor for an exam and have the doctor give you a better understanding of expectations.  You may need anywhere from 1500 to 3000+ grafts.FUE will thin out the hair on the back as you remove more grafts.  Genetic balding will thin out the existing hair on the front and top.

That's a pretty aggressive hairline that you want. You need to see an HT doctor in person to discuss this in any useful detail. CAN it be done? Probably...Should it be done? Probably not IMO. I would recommend you go a bit more conservativeDr. Feller

you can do hair line lowering using hair transplant procedure. It is of utmost importance that you find a hair restoration doctor with experience to dense pack the frontal hairline to mimic the existing hair. You need to be aware that the density of the implanted hair will not be the same as the existing hair however an experienced doctor can make the illusion of the same density. Also the placement of the hair line is very important, and your doctor should have enough experience to place it where it will look natural. You may need about 2000 grafts to get good density. 

Grafts could work whether taken by FUE or FUT.  I would think you might need up to 3500 grafts in two sessions , and one year for growth  to get a thick looking result. if you are over 30, have never lost any hair in front, have no balding history in your family and have a flexible scalp and forehead, a single hairline lowering operation could give you an instant result at about half the price of grafts . There would be no linear or punctuate scars on the back of the head. If you want advancement of the temple hair, it can be done on the same operative session adding the cost of about 500-700 grafts taken from the ends of the hairline lowering incision. (No additional scars)