Chastity and orgasm denial discussion

Hello everyone. I’m posting here for the first time and need some guidance. I really want to give chastity a go, so I’m considering purchasing either a CB6000 or a CB6000s from eBay. When soft, my cock measures about 5cm in length by 9cm around, but when erect it extends to 15cm long with a 13cm circumference. My testicles sit quite high as well, so standard cock rings aren’t very comfortable once I’m hard. I’d appreciate any insights from those who have tried this.