I want the first and last name of the lead owner in the FROM field. Is using these 2 tokens the correct way to accomplish that? {{lead.Lead Owner First Name:default=Deb}}{{lead.Lead Owner Last Name:default= Broderson}}
That is the way I would do it, and it's great that you have the default set as well. It's important to have a fall back in case the tokens don't populate for some reason.
Also be aware that when you add a token to the From field, type a space and then add another token to the From field, the space is frequently stripped out and you have to add it back.