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When cutting along the baseboards, select a piece that will fit in there and leave 10 or 12 inches more and cut it off. Use the other piece on the beginning of the next row. You don't always have to get it in there real close and throw out the end piece. That will save some time and waste.
Be sensitive to the way the ends fit together. One end has a tongue and the other end has a groove -- this is called end matched. Make sure to always cut the wall end of the wood so that you do not cut off the groove that fits to the tongue. If that happens, that would result in a pretty big gap. Find a piece and lay it alongside the hole and flip it over. Make sure when you make the mark to cut off the wall side, not the room side. When you make the mark, butt it up against the baseboard and then mark at the end of that tongue. That will leave a 3/8" gap for expansion and contraction when installing the piece.
Note: Before nailing, make sure to put at least two nails in every board. The rule of thumb is to place a nail every 10" to 12".
As you near the opposite wall, clearance for the pneumatic nail gun again becomes an issue. Drill pilot holes and hand-nail the boards until there is no longer clearance for the drill and hammer. At that point, drill pilot holes down into the top of the boards and face-nail the boards, remembering to set the nails with a nail-set.
Tip: Use a pry bar and a few extra scraps of flooring to firmly seat the hardwood plank as you nail.
If there's a narrow gap for the last board, take a measurement and rip (cut length-wise) the last board to fit into place. Remember to leave a 3/8" gap at the end wall for expansion and contraction space.
Replace shoe molding in the room and putty all of the nail holes that have been face-nailed. Be sure to get wood putty that matches the floor. Fill the hole and wipe off the excess.
Maintenance is easy for a pre-finished hardwood floor -- keep grit off of the surface by sweeping regularly and use a flooring cleaning kit (alcohol-based) and spray on and wipe off with a damp cloth. Hardwood floors also help cut down on dust mites.