Nervous about being a mom!

I'm so excited but I just hope I can be a great mommy. This will be my first.  But I've always been super cautious and conservative when it comes to holding another persons baby. I always feel like I'm doing something wrong, even if it's my nieces or nephews. I'm hoping it's different when it's MY child that I'm holding. I feel like that will be the case. I just get nervous with other people's babies.