It's a great point that pickin' and singin' are two different things.
Yeah, I played in the early mornings in the downtown laundromats when I was in college, etc., etc., etc. And yeah, the Gary Altman - the real name for this South Dakota boy <grin> as I recall - old time radio trick does help somewhat but...
Parenthetically, the regimental song for the 7th Cav under Geo. Custer was "Garryowen."
--- I've a tape of a lady singing it quite well, which would have been typical in 1875 or so. Custer's bandmaster was an Italian immigrant named Felix Vinatieri - NFL place kicker Adam's great grandfather.
Remembering words and getting musical phrasing and fingering chords and plucking/picking/strumming strings all at the same time are a bit much in ways.
I'd recommend - giggle if you will, just humming or using a kazoo.
Or to use the old-time jazz term, "scat singing." In the bathroom, that term might bring up an entirely different sort of image and metaphor, but what the heck. <chortle>
It's always difficult regardless of your degree of experience. I'm at the point where I can play some half fancy fingerpickin' stuff while I'm singing stuff I really do know how to play - but when I'm singing, I have a bad tendency to overdo the fancy guitar stuff because I've made it into muscle memory rather than into a "okay, when I'm singing, I'll back off on the guitar except for fills."
That's where recording yourself probably is among the last steps before getting into a public performance mode. You then realize what's going on with the guitar backing as well as the vocal phrasing that should have been figured out with humming or scat singing or kazoo while you've independently memorized and sung the words. <grin>
In fact, given the cost of recording stuff when I was a "kid," nobody did it until cassette recorders at $100 or less - the equivalent of maybe $6-800 today - hit the market to replace hauling around a big reel-to-reel rig.
m