Last year I had a terrible time trying to fillet fish. I was using a cheap 15$ knife(rapala I think) and I never sharpened it since I knew nothing about filleting. This year I plan on keeping many crappie, sunfish and pike so I need to get better. Would it be best to buy a better knife or will this knife serve me fine as long as I sharpen it often? What are some good knife sharpeners? Thanks