Mitered V neck question

So, I’m extremely new to knitting vests. I have the front and back done and now ready to work on the neckline. The goal is to work it in the round. I would like to use a 2x2 ribbing, but wanted to know how can I have a clean mitered v-neck?

Are you working from a pattern? If not, I’m sure there are such patterns, i.e. cricket or tennis sweaters. It’s just a matter of decreasing every row at the miter. Here’s a good video… Good luck!