There's no automated process in PD, and you're right - some of the approaches are highly technical although there are other approaches that are simpler. I don't know anything about the clips you're working with, but if you simply need to produce to a nonstandard pixel size this
post may help.
If not, we could assist you better if we had the full specs of one of your source clips. MediaInfo is a free utility that can display the needed details.
You could also upload a clip to Google Drive or OneDrive and paste the link to it here. See the
Share a file publicly section in this Google
FAQ or this OneDrive support
page if you're unsure how to share a large file.