OK,
Writer #1 suggests changing up "Open to"...
Welcoming Home Brewers...
Regarding the at vs of, Writer#1 feels the real problem with the line is the words "skill levels"
As soon as there's a level there's an implicit judgment involved, so we need to take the level away from skill and make it experience levels.
That would make it "Welcoming Home Brewers of all experience levels"
That might be getting difficult for the poor typesetter to make it work, but Writer #1 doesn't care about that.
The other approach may be to simply remove all reference to levels entirely...
So, maybe just "Welcoming all Home Brewers"
Then the typesetter comes up with...
"Welcoming Novice and Experienced Home Brewers"
Now if Writer #2 ever gets her sorry assed lazy self out of bed, we'll ask her, too.
JW