Using BigDump to Import Database for Local Development

I am having issues making the final connection using BigDump to load my current WordPress site’s database into my local server in order to do some local development as I change themes.

So far I have:
-Installed WordPress locally.
-Retrieved my current WordPress site’s database.
-Created bigdump.php file pointing to a new server I created in myphpadmin for this database uploaded (also includes the sql database file name).
-Placed both the sql database file and the bigdump.php file in the same folder.

This is where I am stuck. I know I need to point my myphpadmin to this file to start the upload with BigDump. I believe I am stuck on where this folder holding the sql database file and bigdump.php file should be located and where I should be pointing my localhost. I have been following this video to no success.

Currently my folder sits on my desktop. Should the folder be located somewhere else? Should the path I point the localhost to include the folder structure to desktop or just to bigdump.php in it? Any other issues I am overlooking?

I appreciate any help in advance. Please let me know if I can provide any further information to help.