What gauge wire do you like to use to trace circuits? Does the enamel burn off when you are soldering or do you need to burn it off prior to soldering?
in the first image that I posted, used (an mainly for my general use) 0.29mm diameter polyurethane coated copper wire
on the DIYduino-nano, I used 0.16mm diameter polyurethane coated copper wire.
I can buy those in 20meter lengths.... quite long enough for such small pcb tracework.
usually I burn off a bit (immerse in hot solder on the iron, not heated iron only), thereby coating the "burned" part with solder, then trimming the "tinned" part to about 1.0 to 1.5mm, then actual solder to board.
attack the exposed part (usually the cut-off/end portion) and let the melted solder burn out the coating.
for making a soldering point within the wire length (first image, bottom right), you need to score/scratch a bit of the coating to expose a bit of the bare wire inside and attack from there.
and do make sure you have some sort of ventilation to suck out the fumes away from you.
parts placement and board wire-trace "crude prototyping" was done using excel and/or libreoffice calc (its what I have and serves its purpose)
...so I have a guide during the actual soldering...