I personally use Sony Vegas to edit videos, but really any video editing software can do it. I've never used Blender and I'm not super familiar with it but a quick google search yielded this which might help https://blender.stackexchange.com/questions/48484/video-sequence-editing-cutting-strips
Trimming a video is basic functionality for video editing programs so that's why you can really use any video editing program to do it. Stuff like windows movie maker might should do it for you (hopefully without messing up the encoding, FPS, or anything) and I think even VLC can trim them. Google will give countless tutorials for various programs.
If you just want to trim a video use Avidemux, it can remove parts of a video or append others really easily and takes no time to save them since it just copy thems and uses the keyframes so you can trim a video in seconds.
Youtube also has an option to edit videos lightly and unwanted parts from them.
Blender is more of a 3D modeling software than a video editor by itself, it's probably overkill
@JaniceBrown I don’t think a 3-year old deleted account is still looking for recommendations.
@Pear Maybe not, but now that the thread has been revived from the dead and is at the top of the forum it probably doesn't hurt to have a few current recommendations for people who inevitably click in the thread looking for an answer.
For what it's worth I use OpenShot video editor. I really only have used it to trim videos so I can't speak to total functionality but it is free, and it does work.
[quote=O.D.W.]I've been looking into DaVinci Resolve lately, though I've not had the time to really get into it. It's very much overkill for most speedrun needs though.[/quote]
+1 for DaVinci Resolve. As far as free alternatives go, it's by far the one I found to be most complete in features.