Keyframe editing help

[Outcast]

Is it possible to slow down a particular animation (e.g. "melee idle", or  "idle") ?  I've encountered a few meshes with jerk-like animations i was hoping i could somehow fix? Maybe by slowing the motions down a bit. Or maybe cut out the first few seconds of the animation? Where a limb would be bent out of shape?

If it's possible, would anyone be willing to teach me how it can be done?