I did this after 4 years at BigCo. It helped to set a reasonable deadline for when I wanted to hand in my notice, then I worked backward to set milestones for m

I did this after 4 years at BigCo. It helped to set a reasonable deadline for when I wanted to hand in my notice, then I worked backward to set milestones for myself (e.g. identify a round of companies of interest by X date, apply by Y date...). I ended up missing my "deadline" by a bit, but it got me off my ass.