I've always wanted to play a Touhou game for score at some point, so I decided to try PCB Extra scoring, since it's my favourite Extra stage, and the first and only Extra that I've NMNBed so far. Since world records are way out of my league, I decided that 1 billion points would be a more realistic goal for me. I've looked up how to do the bombing at the beginning, but other than that, I'm coming up with my own route, since I find that more fun than trying (and inevitably failing, because I suck) to copy superplays.
Progress so far: Current stage route gets me around 230m points and 525k cherry coming into Ran. Recently finished a 872m run that had 2 deaths, 3 failed spells, and missed the last extend, costing me around 120m in clear bonus alone ( 20 x 3 lives x 2 (Extra multiplier) if my calculations are correct). So it looks like I'll be able to reach my goal if I don't die and allow one or two failed spells. Perhaps I could aim higher, but I don't know if I'm good enough to reach 1.1bil.
So far, I've enjoyed experimenting with different strategies, and I like the concept of grazing for piv while in border mode (Even though I suck at the supergrazes). I get frustrated over my failures occasionally, but that will potentially happen when I do anything I find challenging in video games, so overall, I'm having fun so far.
Edit: After some more practice, got a score of 1.06B. Target achieved. I'll probably get around to attempting some of my other goals, like 1ccing PCB Lunatic, before I try to improve this.