Consider mindfulness meditation.

As for keeping on top of things, you will not do that by having your mind on constant overdrive and feeling stressed. You will just burn out. So factor in time to relax and look into meditation – by looking after yourself, you will have the energy and resource you need to have a clear mind and really get things done. That will give you the edge you’re looking for. Being burned out, stressed and constantly lost in thought is a recipe for exhaustion.