Mixed emotions

I have yet to actually start putting fish together and for sure decide upon which fish are going into the tank with my betta, but I'm already stressed out about the entire thing. I just really don't want anything to go wrong! I'm sure something will, something has to, but it's waiting to find out what that is that is stressful to me. On the other hand i'm really excited about it. I'm just proud of myself for trying. If all else fails I will get a goldfish to live all alone in my tank. At least it will be used.