+1 on do it yourself.

Not hard, not expensive.

works best if you get good tools, not try to do by eye.

ideally, 2 stones- one rough/coarse one smooth/fine

on coarse stone, find your angle. In best world, use a clamp, or some type of guide to KEEP THAT ANGLE.

Take 10 strokes on that side, straight, circle, whatever. Check for a burr. keep repeats ON THAT SIDE until you have a burr on full length. ( that means you have reached the edge on that entire side. )

turn over. repeat on other side.
You now have primary edge;profiling done.
If this knife has never been profiled to this angle, this can take awhile......

NOW, move to fine stone. raise your angle SLIGHTLY- maybe 10 degrees. MAKE SURE you do NOT put blade down edge first...
this time, single strokes, smooth, from base of knife to edge. DO NOT PUSH HARD. turn over, repeat.

This sets the secondary edge; the cutting edge.


If you want a simple article,
http://sharpeningmadeeasy.com/Juranitch1977Feb.htm