Just be mindful of injects during a fight. If you don't think you can keep on-top of it, just inject before you go and attack
I've heard that at lower levels, you can be better off just a-moving your army and not even watching the battle; making sure your larve injects, supply and unit production is maintained is much more important than the bits of micro you can do with your army.
Macro is 90% of the game until Diamond league, it's better to get that downpat before worrying about micro.
(Easier said than done of course; I still like to watch my battles, just because they look so damn cool. :P)
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