Like a painting chore, the prep time with shrimp is the most important. A lady from India clued me into the importance of husking them, prior to cooking and recommended to me 
this handy dandy shelling de-veining tool .
One health note, the "vein" of the shrimp contains all sorts of healthy sea-found benefits, but at the cost of a bit of grit to the palate. That's why of late, we've been using the farm raised Tiger Shrimp whose farmers allow them a few days to cleanse themselves prior to market. No vein, easily peeled, boil, chill, enjoy. Voila