Dear Mari
I've seen (but not heard!) these critters!

They are mild mannered but can bite. I would handle them pretty much like any other lizard with a little more caution about the bite (i have been bitten by other lizards, it's like having a hair pin attached to your finger. no blood. i've read geckos have a mean bite though - might wear hand protection or in any case not put fingers in their face.)
perhaps the best thing to do with your guest is leave it there. if you think hubby will try to kill it

you could try and move it during the day time hours when it is less active.
if you decide to do that, make the attempt from outside the house, shutting the inner door behind you. i have often used paper cups and cardboard to capture small creatures - anything too small/delicate for me to catch without hurting, or stuff i'm a bit wary of like insects or spiders.
you could wear rubber or garden gloves if you're concerned about being bitten. you need to be very gentle, move in slowly and be careful not to make the "gotcha" move so suddenly that the rim of the cup maims the animal.
bear in mind, if it panics you end up with 2 pieces - a
tail-less,
panicky gecko and a
gecko-less,
jumping tail. this is "normal" - the tail mostly regenerates - takes 3 weeks.
i'd probably let it alone so it catches bugs and keeps its tail, especially if hubby doesn't open that window and won't likely notice it and murder it promptly.
i don't get that he kills them, but feels sad when he finds a dead one?

that's like 1+1 = 1 ?
~ waves ~