Male half replying here ...
Yes!
Is that a serious question? Didn't you ever get nervous about anything else you had dreamed of doing? Going skydiving? Learning to drive? Your first cruise? Really REALLY wanting to do something doesn't prevent you from being nervous about it the first time you do it.
Get back on the horse and ride again.
"She POOPED on our floor!!! What would you do?" My first thought had to do with newspaper, moving it closer to the door each time, pushing her nose in it, spanking. But then I quickly realized that this wasn't about the dog.