I'm working on the new Lightning Web Components Specialist suberbadge and I've run into a problem on part/challenge 4.
In the instructions it says to "Show the spinner while the form is loading the boats. Use the attribute isLoading via the two following methods: handleLoading() and handleDoneLoading().".  They gave me some code pre-written, but it appears to have a good bit missing and I'm having a lot of trouble figuring out how to make it work.

I've given the spinner an id in the html and then tried to reference that in the JS so that when the page starts loading it will show the spinner.  But the JS doesn't look like the JS that I know, and when I go back to the prerequisites for the superbadge to get some insight, the stuff they showed me there doesn't work here and I don't know why.

Any help would be appreciated, thank you!