In reply to mypyrex:
Don't underestimate how much computer power and memory editing a movie will use up. If your PC/Laptop is relatively low powered/old, you may struggle so need to budget for an upgrade.
Friends with GoPros love the quality, but moan about battery life!
As others say, keep things really tight when editing, even shots lasting just a second or two can really make for an interesting video if editing together well. And don't just include shots from one viewpoint, try other angles, close ups, scene setters etc.
I am useless at all this, which is why I stick to traditional photography and words!