Okay, not so much a step, but as you see here...long jeans, flat shoes. Your shoes that you want to wear...you'll want those on. It will help dictate your length to faux-hem.
Then, cuff your pants to the length you want them to be. I do both legs at the same time, to help ensure they're even.
Then (and this is the tricky part but once you get the hang of it, you're golden) hold onto the hem of your jeans and tuck the cuff underneath into your leg.
Viola! Adjust hem, bunching as needed. You can see here in the close up a little fold line, but once you stand up, it's really hard to notice. And the closer the fold is to the hem, the harder it is to see even close up. (As seen with the back part of the leg in this shot).
Optional: Use a safety pin or a regualr pin to pin the inside to hold it more secure. Just be sure to hide the pins as well. I haven't had any issues with my jeans coming undone. I think if I was doing this with a pair of dress pants, I may want to use some pins to hold them.
Easy peasy. Now you'll be able to wear your favortie jeans with heels or flats. And if you're doing the 30 for 30 challenge, you may be able to squeak out a few more outfits with this little trick.