I installed a 1,000 sq. feet of cherry flooring in my home. I didn't care for the exposed face nail look.
I used 15 ga to face nail the first row. The face nails are covered by the trim. The next couple of rows were left unnailed. I used a regular floor nailer on the fourth row. Also, on the fourth row, about 2 feet away, I screwed a 2x4 to the floor, and used spreaders to tightly press all the rows before nailing.
The final rows are the same except use a pry bar and 1/4 inch plywood against the wall instead of the 2x4.
Picking straight boards for the beginning and ending rows make the whole process much easier.
After 5 years, zero problems.
Also, read "Hardwood Floors" by Don Bollinger on Taunton Press.