Easy is not the word I would use. Once you have got it sorted it might be easy, but it is a deceptive joint and looks simple. Do lots of research, and you will probably come to the conclusion that a spiral cut bit is the thing to go for to reduce chipout, breakout, splintering, whatever you like to call it.
Yes you can do finger joints with a router. A relatively simple jig is needed with a locating peg (dia same as finger) spaced the same (finger) distance from the router cutter (size of finger, obviously). End cut though timber (stagger & clamp the boards together so alternate pins are cut in one action) and have a sacrificial piece to prevent breakout. It goes without saying that proper support of the workpiece needs to be considered.
If you've got a table saw you could make them on this.
Its not too hard to knock up a jig as symptons says. I have done it with the router table and table saw using a blade with flat top teeth. Use my Leigh jig now though.
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