Welcome to the tpf Meg and welcome to the addiction! You can finds lots of info here and we are more than happy to enable you. Safety chains-people either like them or hate them. Over time opening and closing of the clasp may cause it to "loosen" or weaken which is one reason someone may use a safety chain. They are kind of a pain with twisting etc. If you chose not to have one, you can do as you say and get clips for the ends to prevent beads screwing on/off. I had one SA tell me she used a spacer but I probably wouldn't as they can easily fall off when putting on/off your bracelet. As for sizing, it sounds like yours may be a size too big. I think the judgement is to have 2 fingers not 3. If you add muranos they will take up more room and also I have read where over time the bracelet may stretch a bit from the weight of the beads. It sounds like you may indeed need to swap. I was talked into a 7.9 for my first bracelet and although I still can wear it, I MUCH prefer my other 2 which are 7.5. Get what you feel comfy with.