My biggest problem was always avoiding a wider bevel on the tip (even moving the blade backwards down the vise). Takes a while to dial down the details. It is also easy to overdo it and then you end up eating the belly of the blade ... gotta be careful.
So anyway, what's a thread like this with no pictures ... here are some of my results ... I usually do a 24 degree bevel and I convex it to 20 or 19 with one degree intervals. The last two (20 and 19) I mostly use 1000 grit and higher to polish any imperfections from the coarser stones.
Let me repeat ... I destroyed a cheap knife or two before I got these kinds of results, so do be cautious! Oh ... and I almost sliced a thumb off once (it basically took the place of a stone and ran the entire edge ... nasty). ALWAYS focus on what you are doing and be safe! It wasn't fun.
And a couple crazy blades I got the balls to polish! (just a polish, no metal removed whatsoever).