I prefer Arkansas stones with oil, but DMT and Lansky and a couple other reputable brands make sharpeners with set angles. It takes time but if you are serious about a hobby in bushcraft and cutlery I'd highly recommend getting a 6 dollar fine grit Smith's Arkansas stone to practice on cheap knives. Sharpeners with set angles only really work on flat grinds, scandinavian and convex edges can be really messed up by a fixed angle sharpener. The longer you practice the better you get, buy a 5 dollar 440 A knife, sand down the edge, or just use it til it's dull, then when watching a movie just practice sharpening at a set angle and take a look at what the outcome is.