How To Make Gifs Like Jen Makes Gifs (in Photoshop CS6) - There are large images in here!
First, go to File -> Scripts -> Load Files into Stack...
You'll get this "Load Layers" thing. Click "Browse" and select the caps you want to use for your .gif. Click OK. It can be as many frames as you want. The longest I've made has been 32 frames.
Make sure you have "Window -> Timeline" selected. Timeline is where the important stuff is.
Now that you have your images loaded and your timeline visible, click "Create Frame Animation" in the Timeline.
Go to the far right of the timeline and click the little icon. When the options pop up, click "Make Frames From Layers".
You may need to reverse the frames if they're in the wrong order. Just go to the same icon and select "Reverse Frames".
Now at the bottom of the timeline, you have to choose how many times your .gif will repeat. Make sure it's set to "Forever", or it'll just stop when it's finished. And no one wants that.
If you click the little play icon in the timeline, you should be able to see the gif in action---albeit really fast, becauase you haven't set a longer frame delay yet.
If you need to delete a frame, just drag the frame to the little trash can icon in the timeline. Do not just hit delete. If you do that, you'll get a white frame instead of no frame.
Now to slow down the Frame Delay to something less chipmunk-on-crack, highlight all the frames...
...and click one of the downwards arrows on one the frames. Doesn't matter which one, because the new speed will count for all of them.
The speed will vary by gif. Just play around until you find a speed that kind of resembles regular human speed. If one of the presets doesn't work for you, hit "Other..." and set your own. I set this one to 0.13.
If you want to make any adjustments to the picture, now's the time to do it. Make sure the first cap is selected so the filter will work on all of them if you do this.