TL;DR: How do you keep yourself working steadily on a long-term project, with a lot of illustrations, without falling off the wagon or off schedule? Bonus points if you can recommend practices that have worked for you with a similar project!
I'm currently working on a pretty big illustration project (for me) - a series of seventy-nine ink-and-watercolor mixed-media pieces, 9x12". That's 79 pieces NOT counting any re-dos I may have to do. It's a Tarot deck, for those interested (and yes it has an extra card). So there aren't really going to be repeated characters, just some motifs. Ideally the style should be consistent, and i certainly want to use the same materials throughout. I'm working independently, planning to do this as practice and portfolio items, or possibly self-publish.
Here's my question : How do I keep my momentum? My momentum/motivation are great right now - I'm meeting my quota and then some - but I know from past experience that this won't last forever. I'll hit slumps, I'll hit roadblocks, I'll get art block (scream of terror here). I'm just concerned because in the past, I've bailed on most of my long term projects. It took me 15 years of trying to complete a comic at all, to even make a 30-page one-shot.
I'm working on briefs/scripts for myself for each image, and I have a solid write-up of what I want and intend the overall project to be. I'm taking the scheduling week by week right now, looking at taking pretty much the rest of this year to do this project (it's March as I write this). I schedule time for painting as best I can, but I'm new at watercolor, and watercolor is not exactly a "fast" medium. Takes time for washes to dry, and such...
Anyways. Any help/experience would be much appreciated. Or stories from similar projects. Or just sympathy for my crazy self deciding to do this crazy huge series!