Automatic needle threader

Yes staple gun, I don't think a desk stapler would be able to drive the staple into the wood. It's hard on the hands I find lol

I've been able to pick up this kind of threader at JoAnn's and other crafty sorts of places for $1 or less. That variety only has one space for a needle and only does thread for hand-sewing, but they generally work well, and are so cheap that when they go kablooey it's not much of a loss. I picked up a dozen for the quilt ladies at the church, and you would have thought I handed them a sack of gold.

Actually there's a tool for doing the same with little brads, instead of points. I personally like the brads better, as it's easier to pull them if you need to remove the piece. Called a frame fitting tool. Worthy if you do a lot of framing. This is from the online catalog for Yarn Tree (who used to sell only wholesale, but I guess now is selling directly).