I tried to start the Quest for the Stone this winter, but I still haven't done the ritual. I would love to, but there always seem to be other priorities.
Maybe you could just read the ritual out loud to yourself, pledging yourself to the Quest? Outdoors perhaps. That wouldn't take too long or be too complicated?
And you could put a special stone on your windowsill, or outside your front door to remind yourself?
Then you could work on the chapters
I find I just have to be accepting of myself, and keep going, no matter how slowly - it's the journey and the learning that's important I think?