Custom Google Domain transfer to WordPress

Hi guys –

I’ve read around on this specific topic but can’t find my answer. Thanks in advance for your help.

I have a blog on blogger with a custom domain. I am trying to transfer the entire blog to WP. I’d like to be able to transfer all the content from blogger to WP and tweak before I point the domain servers to my site’s URL. I’d like to do all this without the site being live.

If I install WP through FatCow (my host) to my custom domain https://www.mysite.com will it bring down my blogger site? My intuition says “NO!” but I am nervous.

Is there another way to get my blog to WP, tweak it 100% to satisfaction, and then make it live without affecting the blogger site in the meantime?

Clear as mud? ??

Thanks!