I have some 5 minute footage that I have, I simply want to add my intro and outro to that video before putting it on YouTube, if I do that within after effects, I have to render all of that which would take forever on my computer, is there an easier option?
Using After Effects, I don't think there is. But there are ways to make your life easier. If you have a complex comp, if you've rendered the whole thing out to a format like ProRes (even though the files are large), it's relatively quick to drop in an extra intro and outro either side of your ProRes file, so you won't have to re-render the entire project again. You could also look at pre-renders to speed up your projects.