Seriously asking : how? I can't cheat my brain into not automatically seeing the next steps after that and the cascading relation between the all. Within a second or less.
A related if not the same thing I've been trying to do, especially with some DIY type work, is that it doesn't matter, deal with that later, just get this done thing for now.
I.e. not somehow trick yourself into not thinking about it, but just think who knows if/when I'll actually get around to that, for now just do this. Don't worry about optimal order.
If the skirting doesn't look as great as it could because I fixed and painted the doorframe first, only painting the wall and rest of skirting later, meh who cares, if it turns out to be that noticeable maybe I'll get around to giving it all another coat; in the meantime at least I got it done, not stuck in 'analysis paralysis'.