Start temping as soon as you can. I temped and charted CM and only used opks in the last month I think. I found fertility friend really helpful for me, O was so obvious! As another woman with PCOS, it was nice to know it was happening :) Just make sure you keep that BBT next to your bed and stick it in your mouth as soon as you wake up before you get out of bed or do anything - same time each day if you can. If you're a mouth breather, some women have had better results temping vaginally, but that's not something I ever tried!
Good luck, I hope you get a +ve opk this cycle so you know things are going well :) I'll be stalking your journey!