a dedicated place in the house, doesn’t need to be a place reserved for guitaring only. Just a place where you can go to, to get in the right mindset.
Timeboxing is mentioned before; knowing in the morning or the day before when you want to spend x amount of time sure helps.
Remove distractions and manage expectations; I tell my family I’ll be up “making music” for the coming hour or so. Try to get done what needs to be done (that day) first though. When you have kids, timeboxing becomes even more crucial.
Then, when you are in your place, time and “zone”; approach the song properly: Tip: Memorizing songs