You asked two questions here.
1) You can teach yourself to pitch, though I think unless you are a natural you'll have a hard time fixing any mechanical issues without someone who knows what to look for watching or taking video of yourself to analyze. But you're just looking for "good enough" to pitch BP, so you probably can live with some mechanical problems if you're throwing strikes.
2) You can teach the basics even if you can't pitch well. I've learned so much from the threads here. I'm far, far from an expert, but I feel I can teach the basics of I/R and diagnose some obvious/major flaws. I still encourage my pitchers to get lessons from a good PC. I don't think you need to be good at pitching to teach it, but you need to at least be able to demonstrate what you want them to learn.
1) You can teach yourself to pitch, though I think unless you are a natural you'll have a hard time fixing any mechanical issues without someone who knows what to look for watching or taking video of yourself to analyze. But you're just looking for "good enough" to pitch BP, so you probably can live with some mechanical problems if you're throwing strikes.
2) You can teach the basics even if you can't pitch well. I've learned so much from the threads here. I'm far, far from an expert, but I feel I can teach the basics of I/R and diagnose some obvious/major flaws. I still encourage my pitchers to get lessons from a good PC. I don't think you need to be good at pitching to teach it, but you need to at least be able to demonstrate what you want them to learn.