I assume you'll follow one of the procols. You could choose to follow the one that lasts a few days.
SN isn't the most reliable method when done impulsively. Fasting and antiemetics seem more likely to contribute to success. So, I suppose telling yourself an inpulsive attempt could very probably fail might work putting you off.
Plus, i suppose- try to focus on the importance of doing these other things and the bigger mess (presumably) if you don't do them. I'm guessing you're refering to making a will, writing notes maybe?