1. I imported my video clip into Photoshop using the import video frames to layers option.
2. Next, I opened up the timeline at the bottom of the screen and selected New layers Visible in All Frames in the small Timeline drop down in the upper right corner of the timeline.
3. After that, I cropped all of my frames by clicking on the first frame, holding down Shift and scrolling to my last frame and clicking on it to select all of my frames, and then using the Crop Tool (5th tool on the side tool bar).
4. Then, I resized all of my frames by clicking on the first frame, holding down Shift and scrolling to my last frame and clicking on it to select all of my frames, and then resizing my image under the Image tab and selecting Image Size.
5. I then deleted a bunch of unnecessary frames by selecting several of the frames on the timeline and clicking the trash button at the bottom of the timeline in order to make my final GIF file size smaller.
6. Lastly, under the File tab I clicked on Save for Web… and selected the Optimized version as well as made sure it was saving as a GIF (drop-down under the Preset drop-down). I did not play around with any of the other settings.