The only thing I can add to this thread is that hammering frets in with a hammer just does not work very well. No matter how skilled you are are, the frets are going to come out ever so wavy. If you like sanding and dressing frets, stick with the hammer. And nobody likes sanding and dressing frets unless you are a complete obsessive compulsive disordered person. Otherwise, get with the program and get a proper fret arbor. This is one have-to-have must have tool. I now use my "fret hammer" as a super expensive tack hammer for pounding tacks into the wall.
As far as the router goes, I agree Pete. Gotta have tool for the complete kit. However, I have resisted and still use thumb planes and sand paper and etc. to trim my tops and backs. Kinda dumb I know. I just spent the better part of a morning today trimming top and back waste which would have taken me minutes (seconds?) with a laminate flush router trimmer. Why to I persist? Mainly poverty and stubbornness I guess. Also I just love carving with planes. I love that skritch-skritch sound and feel. My patience however is not infinite. Plus I am a player and I really value my finger tips if you know what I mean.